I:

1, on

2, on

3, for

4, at

5, at

6, in

7, on

8, in

9, in

10, between

II:

1, so

2, because

3, so

4, and

5, so

6, or

7, but

8, because

9, and

10, so 

11, and

12, so

13, because

14, although

15, ko biết vì bạn chụp thiếu

III:

1, wasn't

2, bought

3, went

4, likes

5, is writting

6, played

7, am speaking

8, bought

9, wasn't

10, didn't visit

11, does-drive

12, haven't seen

13, have learnt

14, reads

15, have lived

IV.
1. were not / weren't
2. bought
3. went
4. likes
5. is writing
6. played
7. am speaking
8. has bought
9. was not/ wasn't
10. were not visited/ weren't visited
11. Does... drive
12. have not seen/ haven't seen
14. have learned
15. have lived