You can get to Hong Kong using different kinds of ________, by air, by sea or by land.
| A．travel | B．transport |
| C．schedule | D．journal |
We writing a letter of complaint to the manager himself．But we'd like to hear your opinion first．
| A．have been thinking of | B．had thought of |
| C．were thinking of | D．thought of |
—How long do you suppose it is he arrived here?
—A week or so．
| A．when | B．before | C．after | D．since |
When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival．
| A．asked | B．being asked | C．having asked | D．asking |
—Hey, did you enjoy the vacation in London?
—No．Our vacation was totally ruined; not only was the food terrible but the weather was awful .
| A．in the meanwhile | B．as well |
| C．as a matter of fact | D．in addition |
Without the contributions of Qian Xuesen, the father of Chinese missile, the achievements in space technology unthinkable in China．
| A．would be | B．would have been |
| C．might be | D．should have been |