----Must they clean the classroom now?
----No, they ______.
| A．can’t | B．needn’t | C．mustn’t | D．don’t |
He likes watching the children________football．
| A．play |
| B．to play |
| C．playing |
| D．plays |
—Why were you late for school?
—Because my bike________on the half way．
| A．broke down |
| B．broke off |
| C．turned down |
| D．turned off |
The teacher________the office for a few minutes when we arrived．We didn’t meet him．
A．have left
B．had left
C．had been away from
The boy________his mistake before his teacher told him．
| A．realizes |
| B．has realized |
| C．had realized |
| D．would realize |
They________about eight hundred English words by the end of last term．
| A．have learned |
| B．had learned |
| C．will learn |
| D．are going to learn |