Recent pressure at work may___ his behavior.
| A．stand for | B．leave for | C．pay for | D．account for |
The secretary worked late into the night, ______ a long speech for the president.
| A．to prepare | B．preparing | C．prepared | D．was preparing |
—Tom graduated from college at a very young age.
—Oh,he__________have been a very smart boy then.
| A．could | B．should | C．might | D．must |
Michael ______ be a policeman, for he is much too short.
A. needn’t B. can’t C should D. may
Why!I have nothing to confess(坦白) . ______ you want me to say?
| A．What is it that | B．What it is that |
| C．How is it that | D．How it is that |
The road is covered with snow.I can’t understand ______ they insist on going by motorbike.
| A．why | B．whether | C．when | D．how |