Americans spend more money than they have by using credit cards, so they are always .
| A．in peace | B．in danger | C．in relief | D．in debt |
When my father is upset, he would rather ________.
| A．leave alone | B．we left him alone |
| C．left alone | D．we leave him alone |
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 |
—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 |
—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 |
—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 |