Ex1:

5 . would have enjoyed

6. had known

7. had stopped

8. had called

Ex 2:

1. If i had been hungry, i would have eaten anything'

2. If i had known that you were sick yesterday, i would have gone to see you

3. If Mary hadn't worn a seat belt, she would have injured in the crash

4. If i had had some money on me, i would have taken a taxi

5. If it hadn't rained, i would have gone for a walk

Ex 3:

1. If i had been paying attention, they would have seen the sign marking their exit from the highway

2. If the sun hadn't been shining, we wouldn't have gone to the beach yesterday

3. If the music hadn't been playing liudly at the restaurant, I would have heard everything Mr. Lee said during dinner

4. If Rosy hadn't studied, she would have answered the phone

5. If he had known what his father was saying, he wouldn't have been listening to music