【推荐1】Everyone ________ play a part in saving the earth.

A．could

B．might

C．would

D．should

【推荐2】When Ann was eight, she ________ play the piano very well.

A．need

B．must

C．could

D．may

【推荐3】—Dad, can I play computer games tonight?
—Sure, but you _______ go to bed by 10 p.m.

A．can

B．must

C．could

D．may

【推荐1】— ________ I wear a helmet while riding an e-bike?
— Certainly. Or you’ll be fined according to the new traffic rules.

A．Can

B．Must

C．Should

D．Shall

【推荐2】—Is it really necessary for me to go shopping with a mask on?
—I’m afraid you ________ in public. It is not only to protect yourself but also to protect others.

A．must

B．should

C．can

D．need

【推荐3】—Could I hand in the report tomorrow, Ms. Jones?
—Of course you ________. Just take your time.

A．should

B．can

C．will

【推荐1】—Someone is knocking at the door. Is that Li Hua?
—It ________ be him. He is giving a performance in the theater now.

A．must

B．mustn’t

C．can’t

D．shouldn’t

【推荐2】—Must I leave now? It's still raining hard outside.
—No, you ________. You can wait till the rain stops.

A．don't have to

B．couldn't

C．can't

D．shouldn't

【推荐3】—Oh, Paul made himself dirty again! I guess a tiger ________ change its stripes.
—Take it easy. He just needs time.

A．can’t

B．shouldn’t

C．mustn’t

D．may not

【推荐1】—Mom, I didn’t sleep well last night and I’m so tired now.
—Oh, my poor baby, you ________ stay up late to play with your new mobile phone.

A．wouldn’t

B．needn’t

C．shouldn’t

D．can’t

【推荐2】We _________ help people who are in trouble.

A．need

B．shouldn’t

C．should

D．needn’t

【推荐3】— Listen, it sounds like a baby crying in the bushes.
— I’m afraid not.   It          be a cat. But who knows?

A．must

B．should

C．might

D．would