I was about to leave the office ______ an unexpected visitor came.
A. while B. as C when D. before
Word comes _____ free books will be given to ______come first in this book fair．
| A．which,no matter who | B．that, anyone who |
| C．which,whoever | D．that,those who |
The fire _______ before the fire-fighters arrived．
| A．has been put out | B．was put out |
| C．had put out | D．had been put out |
With some snow on top of it,the Yellow Mountain looked fantastic this winter．Actually, I doubt whether we
could visit ______mountia
n in China．
| A．a most beautiful | B．the most beautiful |
| C．a more beautiful | D．a beautiful |
---Would you mind letting me ______ your laptop for another two weeks?
---No problem．
| A．borrow | B．keep | C．lend | D．bring |
It is well known that water is not _____ endless resource,nor _____ that can be made once more．
| A．the, / | B．an, one | C．an ．that | D．/, one |