This math problem is too difficult. Can you show me________, George?

A. what to work out     B. to work it out   

C. how to work it out   D. how to work out it

It’s easy to _____ this math problem.

        A. work out       B. find out        C. look out

— What do you think of this math problem?

—It’s too easy. _____ in our class can work it out.

There was once a millionaire(百萬富翁).He loved money more      anything else in the world. He didn’t know exactly how       he had. So he asked a little girl to count(數(shù))        his money for him. It        the little girl six days to count his money. When she told the millionaire       he had forty-two million dollars, he was very glad       asked, “How much pay do you want ?”He     that she was only a child, he could cheat(騙) her.

    The little girl said, “Well, I worked      six days, so I think you _    pay me for six days. Give me two pennies for the first day. Each day after that,       give me the amount(數(shù)量) you gave the day before multiplied (乘)by itself.”

    The millionaire thought that in this way he would only had to give her very few dollars. What a _    _ little girl! So he immediately(立刻) asked his lawyer to make a contract (條約). He was afraid that she would change _ ___.

On the first day, the millionaire paid her two pennies, and on the second day, __    pennies. He did what he had planned. And on the sixth day the foolish(愚蠢) millionaire      to give the clever little girl all his money.

  At last, it was more than he had .Do you know why? If you have       in it, you may try to work out this math problem..

1.A. as          B. so         C. than        D. then

2.A. many       B. much       C. often        D. far

3.A. both        B. some       C. most        D. all

4.A. cost        B. spent       C. used         D. took

5.A. that        B. what        C. how         D. if

6.A. and        B. but         C. so           D. or

7.A. asked      B. thought      C. told        D. spoke

8.A. in         B. on          C. for          D. at

9.A. had to      B. need        C. should       D. must

10.A. still       B. just         C. really       D. finally

11.A. kind       B. foolish      C. lovely       D. clever

12.A. his plan    B. her life      C. his place     D. her mind

13.A. two       B. four         C. six         D. eight

14.A. need      B. had         C. must        D. may

15.A. interest    B. interested    C. interesting    D. interests