David had prepared carefully for the chemistry exam, as he wanted to be sure of passing it at the first _____.
| A．experiment | B．intention | C．aim | D．attempt |
—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 |
With the price of pork and eggs quickly, CPI has become a hot phrase among Chinese．
| A．climbing | B．climbed | C．to climb | D．climb |