We are going to talk about the problem _____ at the last meeting.
| A．discussed |
| B．discussing |
| C．to discuss |
| D．being discussed |
— Have you seen ____ pencil? I left it here this morning．
—Is it _____black one? I think I saw it somewhere
| A．a; the | B．the; the | C．the; a | D．a; a |
The reading room needs _____, but it’ll have to wait until Saturday or Sunday.
| A．to clean | B．being cleaned | C．be cleaned | D．cleaning |
The environment will be further polluted unless some measures _____.
| A．are taken | B．will be taken |
| C．are being taken | D．should be taken |
—May I go out tonight?
—Of course you can, _____ you promise to be back before 10 o’clock.
| A．as soon as | B．as well | C．as long as | D．as usual |
The company ran into trouble when it tried to expand too quickly, _____ was that it was short of money.
| A．some of them | B．most of which |
| C．one of them | D．part of which |