When I try to understand _______ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
| A．why it does | B．what it does | C．what it is | D．why it is |
The president spoke at the business meeting for nearly an hour without his notes.
| A．bringing up | B．referring to | C．looking for | D．trying on |
The police have started an ___ into the cause of the fire which broke out in the hotel last night.
| A．appreciation | B．investigation | C．operation | D．extension |
- Henry got hurt in the football match this afternoon.
-- ________? I hope it was not serious.
| A．Was he | B．Has he | C．Does he | D．Did he |
He told me he got a new job and would be paid ________ the month.
| A．by | B．in | C．for | D．with |
Never before ________ buying a computer, but now it seems a necessity in my everyday life.
| A．did I think of | B．have I thought of | C．I thought of | D．I have thought of |