Hard work and lack of sleep have ____ her beauty and youth in recent years．
| A．worn out | B．tried out | C．made out | D．sent out |
I ______ for London tonight, for there is ______ an important meeting there.
| A．am leaving; having | B．leave; to be |
| C．am going to leave; having | D．am leaving; to be |
----I _____this morning, but he could not come.
----Well, we’d better go and _____at his office.
| A．called him; call on him | B．called on him; call him |
| C．called at him; call | D．called him; call at him |
_____ from heart trouble for years, Professor White has to take some medicine with him wherever he goes.
| A．Suffered | B．Suffering |
| C．Being suffered | D．Having suffered |
----_____I return the dictionary within three days?
----No, you_____. You_____ it for five days.
| A．May; needn’t; can borrow | B．Can; mustn’t; would have |
| C．Must; don’t have to; can keep | D．Shall; can’t; should read |
Controlling water-pollution is necessary_____ it will be expensive.
| A．so that | B．as if | C．even though | D．ever since |