—No, you _________. The weather is rainy.

　　A. aren’t　　　　　　　　　　　　　　　　　　 B. don’t　　　　　　　　　　　　　　　　　　  C. can’t

　　May I go now?

　　No, you ________.

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　　One afternoon some boys made a lot of noise in class. The teacher got very angry. He 1 them in the class after school. He told them to add all the 2 from one to one hundred together.

　　The boys took out their exercise books. All of them began to 3 the numbers down except one boy. He was new in the school. He looked out of the window for a few 4 . Then he wrote a number in his exercise-book and put up his 5 .

　　“May I go home, sir?” he asked. “I know the 6 now.”

　　The teacher and the other boys were very surprised.

　　“ 7 it here,” said the teacher.

　　The next morning, the teacher asked the boy, “How did you find the answer so quickly?”

　　“Well, sir,” he said. “I didn't want to stay here 8 . So I tried my best to find the answer quickly. Soon I found it. You see, if you add one hundred to one, you get one hundred and one, and ninety-nine and two is one hundred and one, ninety-eight and three is one hundred and one too, and when you 9 fifty-one and fifty, you have one hundred and one fifty times. That is five thousand and fifty.”

　　After this, when the teacher gave the class exercises to do, he gave this boy 10 exercises. The boy's name was Karl F. Gauss. When he grew up, he became a great scientist.

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— May I go to the concert with you?

— I’m afraid not ____ you have a ticket, because I have only one.

A. since　　 B. if　　 　 C. unless　　 　 D. though

-- May I go out now, Dad?

-- No. You let your mother know first.

　　 A. can B. may C. need D. must