1.     She __________ (read) a book at the moment.

2.     My parents __________ (work) in a hospital.

3.     Listen! The baby __________ (cry).

4.     We __________ (not go) to school on Sundays.

5.     He __________ (usually / wake) up at 7 a.m., but today he __________ (wake) up late.

6.     Why __________ you __________ (wear) sunglasses? It’s cloudy.

7.     Water __________ (not freeze) at 10°C.

8.     My brother __________ (not like) pizza, but he __________ (eat) it now because he is hungry.

9.     She __________ (study) English every evening.

The teacher __________ (speak) to a student right now.

Isoamyl acetate là một ester có mùi hương ngọt ngào, dễ chịu tương tự mùi chuối chín nên được sử dụng phổ biến trong ngành công nghiệp thực phẩm, nước hoa và mỹ phẩm. Để điều chế isoamylic acetate, người ta trộn 2,2 gam isoamylic alcohol với 2,2 gam acetic acid, thêm 10 ml H₂SO₄ đặc rồi tiến hành phản ứng ester hóa. Sau phản ứng, thu được m gam ester. Biết isoamylic có công thức hóa học như sau:

a. Viết phương trình phản ứng.

b. Tính giá trị của m, biết hiệu suất của phản ứng ester hóa là 70%.

Read the passage and choose the best answer to each of the following questions

The environment needs our help. The air is  (1)___________ dirty. The river is  (2)___________  of rubbish. Land is polluted. Humans cannot live without air, water, or food. Each of us must act now. Each of us can help. We can use (3) ___________ energy. We can stop using plastic bags carelessly. We can reuse and recycle things. It is not too  (4)___________  to find new uses for an old thing. It doesn’t (5) __________ much time to sort out garbage. It sounds simple to save the environment. It depends on us!

1. A. too                     B. very                       C. enough                  D. as

2. A. lot                      B. filled                      C. full                         D. has

3. A. less                    B. fewer                     C. more                      D. much

4. A. comfortable      B. easy                       C. difficult                 D. important

5. A. spend                 B. take                        C. waste                     D. make

1. Give the past form of the verbs.

❖ Regular ................................................... ❖ Irregular

1. To visit   ................................................... 11. To have  .............................................

2. To look   ................................................... 12. To be .................................................

3. To talk   .................................................... 13. To do  ................................................

4. To stop   .................................................. 14. To take  .............................................

5. To receive ............................................     15. To think  ............................................

6. To arrive .................................................. 16. To buy  ..............................................

7. To rent ..................................................... 17. To go  ................................................

8. To help..................................................... 18. To see  ...............................................

9. To live ...................................................... 19. To wear  ............................................

10. To return  .........................................   20. To put  .................................

2. Tobe in the past simple tense.

1. He (be) ____________ in class yesterday.

2. I (be) ____________ in HCM City two weeks ago.

3. They (be) ____________ very happy in VN in the last spring festival

4. There (be) ____________ an exciting program on TV last night.

5. My children (be) ____________ tired yesterday.

6. Loan (be) ____________ unhappy because she had no friends in the city.

7. Mary (not be) ____________ at the library yesterday.

8. They (not be) ____________ difficult exercises.

9. The homework (not be) ____________ very difficult yesterday.

10. The seafood and orange juice (not be) ____________ delicious.

11. Why your friends (be) ____________ absent yesterday?

12. When you (be) ____________ bom?

13. She (be) ____________ absent yesterday?

14. What the weather (be) ____________ like yesterday?

15. Where she (be) ____________ yesterday? She (be) ____________ at home

3. The ordinary verb in the past simple tense.

1. Anna (walk) ____________ to class yesterday instead of taking the bus.

2. My brother (arrive) ____________ French for two months last year

3. Two years ago, she (teach) ____________ at a village school.

4. I (meet) ____________ her at the movie theater last night.

5. They (have) ____________ dinner in a small restaurant yesterday evening

6. He (take) ____________ his children to the zoo last Sunday

7. John (drink) ____________ beer so much last night.

8. Last Sunday, we (not go) ____________ to the English Club

9. Loan (not receive) ____________ a letter from her pen pal Tim yesterday.

10. They (not live) ____________ in town in 1990

11. She (wear) ____________ a blue dress in her last birthday party

12. What you (do) ____________ yesterday morning?

13. Ba (teach) ____________ Liz Vietnamese last year?

14. My grandparents (watch) ____________ TV last night?

15. Where you (go) ____________ yesterday?

16. Minh’s mother (stay) ____________ up late last night?

17. John (do) ____________ a lot of work last Sunday?

18. Why you (leave)____________  the party early yesterday?

19. What time you (finish) ____________ your lessons last night?

20. Where you (go) ____________ last Monday?

4. Use the correct tense of the verbs.

1. Ba always (make) ____________  a pencil case for his sister

2. He often (send) ____________ a letter to his pen pal.

3. My father sometimes (not drink) ____________ any beer at the party.

4. Miss Trang (not buy) ____________ newspaper this morning?

5. Susan (study) ____________ hard for her next examination?

6. George (like) ____________ swimming when he was 8.

7. They (stay) ____________ at the Rose Hotel last vacation.

8. They (not be) ____________ at home yesterday.

9. Minh (play) ____________ the piano when he (be) ____________ 8 years old.

10. Mary (not make) ____________ the dress for you a week ago.

11. Miss Loan (sell) ____________ out all the newspaper last Monday?

12. What your father (drink) ____________ two weeks ago?

13. Where Minh (travel) ____________  last summer vacation?

14. Nam (send) ____________ a letter to Thailand yesterday?

15. I (not travel) ____________ to the post office last week

16. They (play) ____________ to the post office at this time.

17. We (go)  ____________  to the post office tomorrow.

18. Her mother (cook) ____________ now?

19. Nam (not go)  ____________ to the post office very often.

20. They (travel) ______________ to Australia next week. It’s their plan.

II. Give the past form of the verbs.

❖ Regular ................................................... ❖ Irregular

1. To visit   ................................................... 11. To have  .............................................

2. To look   ................................................... 12. To be .................................................

3. To talk   .................................................... 13. To do  ................................................

4. To stop   .................................................. 14. To take  .............................................

5. To receive ............................................     15. To think  ............................................

6. To arrive .................................................. 16. To buy  ..............................................

7. To rent ..................................................... 17. To go  ................................................

8. To help..................................................... 18. To see  ...............................................

9. To live ...................................................... 19. To wear  ............................................

10. To return  .........................................   20. To put  .................................

1. ………is the longest river in Viet Nam, Red River or Mekong River?

A. Where                   B. Who                       C. How                       D. Which

2. If we cut down more forests, there………more floods.

A.        will be                        B. were                       C. have been             D. are

3. Lake Baikal is the …………. freshwater lake in the world.

A. largest                   B. larger                     C. large                       D. more large

4. I like………… Tom and Jerry is my favorite one.

A. game shows                      B. comedies               C. cartoons    D. educational programmes

5. A robot can do …………. different things from looking after a baby to building a house.

A. many                     B. much                      C. few                         D. little

6. H8 is a home robot. It can………. meal.

A. cook                                 B. understand            C. do               D. work

7. Walking is one of the best ways to…………air pollution.

A. reuse                      B. recycle                  C. reduce                   D. help

8. Which sports do they ………?

A. play                       B. have                       C. do                           D. read