ex 1

1. had

2. did

3. enjoyed

4. tidied

5. talked

ex 2

1. Sara didn't study yesterday.

2. Sge felt nervous before the test.

3. She didn't visit her friend.

4. I played basketball last Saturday.

5. We didn't win the match.

ex 3

1. did you go... Yes, I did.

2. did she meet... No, she didn't.

3. did you have... No, I didn't.

4. did they study... Yes, they did.

5. did it rain... Yes, it did

ex 4

1. was

2. go

3. felt

4. were

5. did they go