(2013·成都一诊)Parents are doing all they ________ to help their children achieve their ambitions.

A．shall　　　　　　　　　B．can

C．may D．need

(2013·江西六所重点高中一模)We ________ take clean drinking water for granted. One day we may run out of it.

A．needn't B．can't

C．won't D．shouldn't

(2013·皖南八校一模)I felt surprised that anyone of his intelligence ________ such an easy test.

A．might have failed B．could have failed

C．should have failed D．must have failed

(2013·济南一模)—Can you keep the secret?

—You ________ worry — I'm not going to mention it to anyone.

A．needn't B．couldn't

C．mustn't D．won't

(2013·银川高三一模)—Where is the post office?

—It's just over there, at the end of the street. You ________ not miss it.

A．can B．must

C．may D．should

(2013·山西省太原市统一检测)—David, the windows of the room are very dirty. ________ I clean them before we move in?

—Of course.

A．Will B．Would

C．Shall D．Do

(2013·江西鹰潭一中高三一模)What a pity! Considering his ability and experience, he ________ better.

A．need have done B．must have done

C．can have done D．might have done

(2013·厦门第一次适应性考试)When my father is upset, he would rather ________.

A．leave alone B．we left him alone

C．left alone D．we leave him alone

(2013·齐鲁名校一模)To make the most of your time, live every moment as if it________ your last.

A．is B．would be

C．were D．has been

(2013·吉林长春一模)—Please don't tell anybody.

—I ________. I promise.

A．can't B．don't

C．won't D．mustn't