6 .ride 

7.to

8. am  

1 didn't use to be 

2 used to write

3 used to play

4 didn't use to travel

5 didn't used to walk

6 used to swim

7 didn't use to watch

8 used to climb

9 didn't use to shop

10 used to buy

bạn cho mik câu trả lời hay nhất nhé

=>
Ex4/
1. is used to ( used to + V / is used to+ Ving)
2. is
3. walked
4. Are
5. use to
6. catches
7. to
8. am

Ex5/
1. used to be
2. used to write
3. used to play
4. didn't use to travel
5. used to walk
6. didn't use to swim
7. used to watch
8. used to climb
9. didn't use to buy
10. used to shop