3 . —Finish the homework in half an hour! Mom, you________be joking!
— Nothing is impossible if you put your heart into it.

A．need

B．can

C．must

D．may

6 . 用can/may/must/shall/might填空
1. The doctor will come to see you again next Monday. Meanwhile, you ________ follow his advice and rest as much as possible.
2. There was a time when people ________ have felt awkward about asking for a table for one, but I’m not sure.
3. While the sun’s rays ________ age and harm our skin, they also give us beneficial Vitamin D.
4. I’m sorry. The kids have been so noisy. ________ they go out for a while?
5. The school rules state that no child ________ be allowed out of the school during the day, unless accompanied by an adult.
6. My phone ________ have been stolen while I was taking a bus. I can’t find it anywhere.
7. You ________ bring your identification when you open a bank account.
8. If you ________ go there on such a rainy day, I suggest you take a bus rather than ride a bike.
9. Though winter is cold in the north here, sometimes we ________ have a few warm days.
10. —________ I have a look at your plan for the robot competition, Smith?
—Sorry, Mrs Brown. I’ve left it at home.

7 . 在组织班级活动方面我们可能有不同的意见。(may)(汉译英)