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 

8.a) introduce

b) before

c) doing

d) myself

e) Excuse

f) meet

g) Let

Dài lắm bạn , chưa kể ghi lại đề mất thời gian nữa ,hơn mấy chục bài lận đó ==''

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

were

were

1.c

2.b

3.d

4.a

5.b

mình chắc chắn làm đúng vì mình được chửa bài này rồi