It is known to us that doing eye exercises ________ our eyes, and that is to say, our eyes can ________ doing eye exercises.
| A．benefits; benefit from | B．benefits to; benefit |
| C．benefits from; benfit | D．benefits; be benfited from |
They must have been here the day before yesterday,＿＿＿＿?
| A．mustn’t they | B．didn’t they | C．mustn’t have they | D．had they |
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 |