You may lead the horse to the river, but you _____ make it drink.
| A．couldn’t | B．can’t |
| C．mustn’t | D．needn’t |
—Must we keep the window open all the time?
A. No, you mustn’t B. No, you can’t. C. No, you don’t have to.
You’d better _______ too much meat. You are much too fat.
A. not eat B .eat C. not to eat
---This bag is too heavy for me. Could you please do me _____ favor?
-----Sure .
A. the B. an C. a
—____
—They’re English books.
| A．Are these English books? | B．Are those English books? |
| C．How do you spell it? | D．What’re these in English? |
—Do you know the girl ____ red?
—Oh, she is my sister.
| A．/ | B．in | C．at | D．with |