. The government has to close those small factories to prevent the water of the river ______.
| A．polluting | B．from polluting | C．being polluted | D．polluted |
She＿＿＿＿＿＿＿＿the film. She knows nothing about it.
| A．can’t see | B．can’t have seen | C．must see | D．mustn’t have seen |
—— Nacy＿＿＿＿＿＿＿＿＿ the letter from her mother.
—— No, she can’t have. The postman hasn’t come yet.
| A．can receive | B．can have received | C．must have received | D．must receive |
I don’t think he＿＿＿＿＿＿＿ a new bike.
| A．need to buy | B．needs buy | C．need | D．need buy |
Tom＿＿＿＿＿＿＿show his exam results to his parents.
| A．dare not | B．dared | C．dare to | D．dares not to |
Let’s clean the classroom, ＿＿＿＿＿＿＿?
| A．won’t you | B．shall we | C．do we | D．will not you |