The temperature has _____ heavily, which doesn’t _____ the growth of the crops.
| A．dropped; contribute to | B．fallen; see as |
| C．decreased; refer to | D．gone; classify as |
Students are often warned that anyone who leaves the classroom at night must remember to __________ all the lights, or he will be fined.
| A．switch off |
| B．go off |
| C．take off |
| D．bring off |
In many states of America, a neighbor may __________ you with playing your radio too loudly.
| A．charge |
| B．blame |
| C．punish |
| D．scold |
Innovation is a natural desire of the human mind to develop variety，__________ activity is involved.
| A．no matter when |
| B．however |
| C．whatever |
| D．no matter which |
The American girl has a good __________ of Chinese and can express herself freely in the language.
| A．item |
| B．series |
| C．command |
| D．usage |
-You're coughing badly, Martin. Why not give up smoking?
-Give up smoking? Easier said than done, Amy. Once you __________ the habit of smoking, it is very hard for you to __________.
| A．keep up; break it away |
| B．take up; drop it out |
| C．pick up; get rid of it |
| D．build up; do away with it |