Ex7

 1. arrived - was still sleeping

 2. went - were having

 3. Did we drink

 4. Did they build

 5. wasn't sitting

 6. were you doing

 7. Did you visit - was going - saw

Ex8

 1. has lived

 2. have waited - hasn't come

 3. have been

 4. haven't been

 5. Have you ever seen

 6. have you studied

1. When I arrived at this house, he was still sleeping.

2. The light went out while we were having dinner.

3. Did we drink a lot of beer at the party the day before yesterday?

4. Did they build a new bridge when I was there 2 months ago?

5. He wasn't sitting in a cafe when I saw him.

6. What were you doing when I phoned you on Monday?

7. - Did you visit the zoo yesterday?

- Yes, I did. When I was going there, I saw our teacher.

__________________________________________

1. has lived

2. have waited/hasn't come

3. have been

4. haven't been

5. Have you ever seen

6. have you studied