If you add three _______ nine, you get twelve.

1. A.
   up
2. B.
   on
3. C.
   to
4. D.
   in

完形填空

　　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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A)根据句子意思，用括号中所给词的正确形式填空，每空填一词。

1.Three __________(four)of the students in our class have handed in their reports.

2.You needn’t be frightened because these insects are completely ____________(harm).

3.If you add some lemonade and sugar，the dish will be much ___________(taste).

4.How ____________(active)they are donating money to help the sick student!

5.Some of the film stars had been ____________(sing)before they entered the film industry.

B)根据句意及汉语提示，写出各单词的正确形式，每空填一词。

6.The charity event is ___________(结束). We all think it is a great success.

7.I dislike this channel because ___________(少数)programmes on it are interesting.

8.Ice turns into water when the temperature is ___________(超过)0℃．

9.一Which of these shirts do you like best?

一I’ll take ____________(没有). They are both expensive and out of fashion.

10.The book he is fond of ____________(描述)how birds live.