He bought three books, _____ is in Chinese, ____ in English, and ____ in Japanese.
| A．the first; the other; the third | B．one; the other; a third |
| C．one; the other; another | D．one; another; the third |
We must take measures to protect endangered wildlife _______ it is too late.
| A．now that | B．as long as | C．unless | D．before |
Listen!, his family must be quarreling, _______?
| A．mustn’t it | B．aren’t they | C．isn’t it | D．needn’t they |
We read them ________; we remember them________.
| A．as young; as old | B．as younger; as older |
| C．when young; when old | D．when younger; when older |
Doctor Brown says that _______ what forceful arguments against cigarette harm there are, many people insist on smoking.
| A．though | B．however | C．no matter | D．even if |
The government has taken some measures to solve the shortage of electricity, but it may be some time _______ the situation improves.
| A．since | B．when | C．unless | D．before |