(a)

1) met

2) left

3) bought

4) had

5) saw

6) got

7) felt

(b)

1) What did you wear?

2) Where did you meet your friends?

3) What time did you get home?

4) How did you go home?

5) Did you have a good time?

(c)

1) She didn't wear a red dress. She wore a blue dress.

2) I didn't leave work early. I left work late.

3) We didn't go by train. We went by bus.

4) He didn't lose his mobile phone. He lost his wallet.

5) You didn't have a sandwich. You had a salad.