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Exercise 1:

1: goes

2: go

3: didn't use to

4: going

5: be

6: studying

7: play

8: play

Exercise 2:
1: My mother used to live in small village when she was a girl

2: There did not use to be many vehicles on the roads before

3: We went to school by bike 2 years ago

4: There are more traffic accidents now

Ex1:

1. Goes

2. Go

3. Didn't use to 

4. Going

5. Be

6. Studying

7. Play

8. Play

Ex2:

1. My mother used to live in small village when she was a girl.

2. They did not use to many vehicles on the roads.

3. We used to cycle to school two years ago.

4. There used to be few traffic accidents before.