ребята помогите с английским (тесты )))

1.The company ...its annual report for a week when this event happened
a) prepared b) was prepare c) was preparing

2.By the 1990s they ...financial empire.
a) built b) had build c) had built

3.Most of the customers ...by the time our managing director got there
a) leaved b) had leave c) had left

4. He had been listening to the conversation and I wondered how much he ...
a)hear b) heard c) had hear

5. We were tired as we ...since early morning.
a) had been work b) had been working c) worked.

6. He kept looking at her. wondering where he ...her.
a) had been seeing b) had seen c) has seen/

7. He had ...for 10 years before he gave it up
a) smoked b) had been smoking c) has been smoking

8.The telephone ...for 3 minutes before I answered it/
a) had rung b) had been ringing c) has rung

9.When I came the Board of Directors ...this contract for an hour
a) had been discussing b) had discussed c) have discussed

10. We ...the discussion by 5 o clock/
a) had been finishing b) had finished c) has finished