Professor Von teaches ______ art in ______ university in America.
| A．不填; an | B．不填; a | C．the; a | D．an; an |
My son ____ the examination, but he wasn't careful enough.
| A．might be able to pass | B．must have passed |
| C．could have passed | D．were able to pass |
---- Must we clean the house now?
-----No, you _______.
| A．needn't | B．may not |
| C．mustn't | D．can't |
It was almost midnight when the fire ____ in the neighborhood.
| A．broke up | B．broke down |
| C．broke in | D．broke out |
A lot of policemen were sent there to ____ the football fans from making trouble.
| A．permit | B．prevent | C．protect | D．prove |
He forgot to turn on the radio. _____, he missed the program.
| A．Otherwise | B．Thus | C．However | D．Besides |