XIV. Use the present perfect progressive or the past perfect progressive to complete the sentences.

1. Emma went into the sitting-room. It was empty, but the television was still on. Someone \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (watch) it.
2. I really must go to see the dentist. One of my teeth \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (ache) for weeks.
3. I hope the bus comes soon. I \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (wait) for 20 minutes.
4. He was very tired because he \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (work) hard all day.
5. At last the bus came. I \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (wait) for 20 minutes.
6. The telephone \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (ring) for almost a minute. Why doesn't someone answer it?
7. Ken gave up smoking two years ago. He \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (smoke) for 30 years.
8. We were extremely tired at the end of the journey. We \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (travel) for more than 24 hours.
9. A: I haven't finished this letter yet.

B: It must be a long letter. You \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (write) since lunch-time.

1. Our game of tennis was interrupted. We \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (play) for about half an hour when it started to rain.