At 3:42 am everything began to shake. In fifteen terrible seconds a large city _____ in ruins.
| A．caught | B．trapped | C．lay | D．stood |
When______ a new word, you’d better_______ a dictionary.
| A．come across, refer to | B．coming across, consult |
| C．coming across, look up | D．come across, consult |
_______ more attention, the cabbages ________ grown better.
| A．Given; could have | B．Giving; could be |
| C．Given; could be | D．Giving; could have |
It was announced that only when the fire was under control ____ to return to their homes.
| A．the residents would be permitted | B．had the residents been permitted |
| C．the residents had been permitted | D．would the residents be permitted |
The next morning I’d just about given myself up for lost _______ I was spotted by a ship.
| A．as | B．after | C．when | D．while |
------ The authors of computer viruses are geniuses.
------ I agree. They can apply their wisdom to other net technology ________ human beings can benefit.
| A．in which | B．through which | C．on which | D．from which |