Выбрать правильную видовременную форму глагола: 1. They 5 computers. (a. has

Избрать правильную видовременную форму глагола:
1. They 5 computers. (a. has offered, b. were offered, c. have offered).
2. Mr. Kelly the reliability. (a. have guaranteed, b. has guaranteed, c. was guaranteed).
3. We a very efficient staff. (a. has had, b. have had, c. has have).