Once our supplies _______, we will take the risk of starving to death.
| A．have dried out | B．are given out | C．have dried up | D．have been run out |
Many children seldom communicate with adults, ________ it difficult for their parents to know what they are thinking about.
| A．making | B．makes | C．to make | D．made |
The headmaster demanded all the teachers ______ in the office.
| A．mustn’t smoke | B．did smoke |
| C．should smoke | D．not smoke |
—How was that?
—I was chatting on line ______ the power went out.
| A．because | B．while | C．as | D．when |
In order not to be disturbed, I spent three hours _______ in my study.
| A．locking | B．locked | C．to lock | D．to be locked |
—What shall I do, go back home or stay here, since it’s so late?
—______. The bus is leaving.
| A．Have a day off | B．That’s a good point |
| C．Get a move on | D．Hang on a minute |