1. Have you seen

2.has not been

3.has not packed

4.has spent

5.have never experienced

6.has lived

have not seen

7. Have they rescued

8. Have you ever volunteered

Ответ:

1. A: Have you seen Jack at all today?

  B: Yes, he left about ten minutes ago

2. A: When was the last time there was an earthquake in the city?

   B: There hasn't been one since 1990

3. A: John hasn't packed his suitcase yet

   B: He should hurry up. His flight is leaving soon

4. A: Jane has spent all summer at an eco-camp

   B: That's nice. I hope she's having fun

5. A: We have never experienced an earthquake

   B: I have. It's very frightening

6. A: Lisa has lived in Haiti since 1999

   B: I know. I haven't seen her since she moved

7. A: Have they rescued any trapped people yet?

   B: Yes, they have saved six people so far

8. A: Have you ever volunteered for a charity?

   B: No, but I'd like to