It was proved that the problem __ partly in the air pollution.
| A．lies | B．lied | C．lay | D．laid |
Let’s clean the classroom, ＿＿＿＿＿＿＿?
| A．won’t you | B．shall we | C．do we | D．will not you |
Children＿＿＿＿＿＿＿＿in public very often.
| A．should be praised | B．shouldn’t have praised |
| C．shouldn’t have been praised | D．shouldn’t be praised |
—— What happened to the young trees we planted?
—— The trees＿＿＿＿＿＿well, but I didn’t water them.
| A．might grow | B．needn’t have grown |
| C．would grow | D．would have grown |
The traffic light is red, so I＿＿＿＿＿＿stop my car.
| A．must | B．have to | C．can | D．mustn’t |
—— Shall I tell John about it?
—— No, you＿＿＿＿. I don’t know his telephone number.
| A．needn’t | B．wouldn’t | C．mustn’t | D．shouldn’t |