— Must we get to the airport before 8 o’clock?
— No, you _____. The plane takes off at 12 o’clock.
A．mustn’t B．needn’t C．wouldn’t
There is no doubt _______ nearsightedness is a serious problem among the youth of our country.
| A．/ | B．which | C．whether | D．that |
You needn’t have ________ the speaker when he was speaking; there was enough time afterwards for you to ask questions.
| A．affected | B．interrupted | C．involved | D．disturbed |
It’s helpful to put students in a situation _______ they can learn how to cooperate with each other.
| A．that | B．when | C．which | D．where |
Lucy is a very optimistic girl. ______ she is faced with difficulties, she always sees the bright side.
| A．Every time | B．Now that | C．As soon as | D．On condition that |
All the people on the list must be told to attend the meeting; you must make sure that no one is _______.
| A．left out | B．set aside | C．cut off | D．kept away |