–Look at that girl! Is it Susan?
--No, it _______ be her. She has gone back to her hometown.
| A．mustn’t | B．can’t | C．needn’t | D．wouldn’t |
You _______ see a dentist when you have a toothache.
| A．may | B．need | C．should | D．can |
— we pick apples on the farm?
—Good idea!
A. Will B. May C. Shall
—Is Mr. Green in the office?
—No, he ________ be in the office. Look, the light in the office is off.
| A．mustn’t | B．can’t | C．needn’t | D．may not |
You play computer games for a long time. It’s bad for your eyes.
| A．should | B．shouldn’t | C．could | D．don’t have to |
-May we leave the classroom now?
-No, you ______. You ______ to leave until the bell rings.
| A．mustn’t, are allowed | B．don’t have to, are supposed |
| C．needn’t, aren’t allowed | D．can’t, aren’t supposed |
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