【推荐1】— Look at the boy playing basketball on the ground. Is it George?
— It ________ be him. He told me he would play basketball after class, but he’s not sure.

A．mustn’t

B．must

C．can’t

D．may

【推荐2】—________ we clean the blackboard at once?
—No, you ________. You ________ clean it after class.

A．Must; mustn’t; can’t	B．Need; mustn’t; may
C．Shall; can’t; must	D．Must; needn’t; may

【推荐3】The boy you saw just now________ be Tom. He flew to New York yesterday.

A．can

B．can’t

C．must

【推荐1】—Mom, could I go out with my friend for dinner?
—Certainly, but you ________ finish your homework first.

A．can

B．could

C．may

D．should

【推荐2】—Mom, ________ I play computer games this evening?
—Sure, but you ________ finish your homework first.

A．can; must

B．must; must

C．may; could

D．may; can’t

【推荐3】Everybody, listen to me. You can’t be too careful with the machines and you ________ touch any of them.

A．mustn’t

B．needn’t

C．couldn’t

D．shan’t

【推荐1】It’s necessary that we ________ wear sports shoes when we have P.E. classes.

A．will

B．may

C．should

D．can

【推荐2】—________I borrow your dictionary?     —Yes, you can ________ it for two days.

A．May, keep

B．Can, borrow

C．May, borrow

D．Must, keep

【推荐3】My grandpa__________swim across the Yangtze River when he was young.

A．can

B．could

C．may

D．must

【推荐1】—Must I go out to have dinner with you, Mum?
—No, you         ， my dear. You're free to make your own decision.

A．shouldn't

B．mustn't

C．needn't

【推荐2】Lynn is often in a red skirt. She ________ like red very much.

A．must

B．can

C．would

D．will

【推荐3】—Does he ________ eat in the dining hall?
—Yes. This is a school rule.

A．must

B．has to

C．have to

D．need