1. I ... waiting for him here since five o’clock.
a) had been
b} will have been
c) have been
2. How many times ... you crossed the ocean?
a) had
b) have
c) have been
3. By the time we reached home we ... counted six wrecks of cars.
a) had
b) have
c) will have
4. She ... playing the piano for two hours when we come back.
a) had been
b) will have been
c) has been
5. The sun ... set by the time we reach home.
a) had
b) will have
c) has
6. I ... trying to solve this problem for an hour.
a) had been
b) will have been
c) have been
7. During the last twenty years science ... made tremendous advances.
a) has
b) had
c) will have
8. When I returned home, I noticed that all my plants ... died.
a) have been
b) have
c) had
9. We ... been smoking for some time in silence, when he spoke.
a) had
b) have
c) will have
10. How long ... we have been working together next spring?
a) would
b) will
c) should