12. Mary ___ her seatbelt when the accident happened, that’s why she was badly hurt.

1. didn’t wear

2. wasn’t wearing

3. hadn’t worn

4. hadn’t been wearing

13. When I was young, I ___ that people over 40 were old. Now that I am 40 myself I don’t think so.

1. thought

2. was thinking

3. used to think

4. had thought

14. She wasn’t interested in the book as she ___ it.

1. wasn’t understanding

2. hadn’t understood

3. didn’t understand

4. couldn’t understand

12. Mary wasn’t wearing her seatbelt when the accident happened that’w why she was badly hurt.

13. When I was young I used to think that people over 40 were old. Now that I am 40 myself I don’t think so.

14. She wasn’t interested in the book as she didn’t understand it.