72.

2. wasn't working

3. was shining

4. were walking

5. wasn't sunbathing

6. was sitting

7. wasn't having

8. was talking

73.

2. - Was the sun shining when they arrived?

- Yes, it was.

3. - Were lots of people walking in the streets?

- Yes, they were.

4. - Were people sunbathing on the beach?

- No, they weren't.

5. - Who was sitting at the back of the restaurant?

- Julia Roberts.

6. - Was she having lunch?

- No, she wasn't.

65.

1. While I was listening to the radio, my sister watched TV.

2. Tom learned English while his father was repaired the car.

3. While it was raining, they played monopoly at home.

4. Children cleaned the house while their mother was cooking dinner.

5. While Alan was working in his room, his friends swam in the pool.

66.

2. My father was washing the car.

3. My little sister and I were watching TV.

4. My elder sister was looking for her ring.

5. My 2 brothers were riding the bikes.