1.
There are both many good things and many potential dangers in social network 
It's important for parents to teach their children how to use social media wisely
Social network is the start of bad things like cyberbullying

2.

A recent report has said that many teenagers have contacted online with strangers and it makes them feel scared or uncomfortable.

Others receive onine advertising that is inapproriate for their age.

It is important that parents should be aware of what children are doing online.

Parents should make their children understand that they respect children's privacy.
However, parents want to make sure that their children are safe.

1 rides

2. collect

3. didn't go

4. bought

5. haven't plan

6. will go

7. have learnt

8. Has Peter visited

9. listening

10. didn't study

1 rides 

2 collect

3 did not go 

4 Bought

5 have not planned 

6 will go

7 have learnt

8 Did Peter and his parents visit

9 listening

10 did not study 

cau 4 thieu than a tourist does cai cho revision for test

Exericse V:

31. B

32.C

33.C

34.A

35.D

Exercise VI:

36. A

37. D

38. C

39. C

40. C

Exercise VIIz;

41. D. time enough \(\rightarrow\)enough time

42. C. rises \(\rightarrow\) is rising

43. C. isn't telling \(\rightarrow\) don't tell

44. C. with \(\rightarrow\) \(\varnothing\)

45. C. taller \(\rightarrow\) tallest

Exercise VIII"

46.D

47.A

48.C

49.B

50.A

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5. The children liked to swim in the rain.

= The children enjoyed swimming in the rain.

6. How carefully he drives

= What a carefull driver.

7. We must cover electrical sockets because children try to put anything into them.

= Electrical sockets must be cover because the children try to put anything into them.

8.a) introduce

b) before

c) doing

d) myself

e) Excuse

f) meet

g) Let