Charles did what he could _____ the servant, although he himself was in danger.
| A．rescue | B．rescued | C．to rescue | D．rescuing |
I was really anxious about you. You _____ __ home without a word.
| A．mustn’t leave | B．shouldn’t have left | C．couldn’t have left | D．needn’t leave |
No bread eaten by man is so sweet as ________ earned by his own labor.
| A．one | B．that | C．such | D．what |
It is written clearly in the requirements that all passengers _______ check onto board thirty minutes before the plane takes off.
| A．may | B．can | C．will | D．shall |
How disappointing! We have finished _______ 5%
| A．no more than | B．no less than | C．not more than | D．not less than |
Tom hid himself behind the door, _______ he rushed out to scare his mother.
| A．which | B．where | C．from which | D．from where |