题目内容：

Liu Yu, a     boy from Shandong, is a running star. He is  his school running team, and has always wanted to be a professional athlete. However, his parents won’t   him to train as much as he would like to. “Of course we want to see Liu Yu achieve his dreams,” says Mr. Liu, “and we know  he loves running. That’s great, and my wife and I have watched him in every one of his races. We have nothing against running! But we do think about that our son needs to be realistic. Now he is getting    , and he needs to think about what will happen if he doesn’t become a professional runner in the end.”

1.A. 15 years old   B. 15-years-old   C. 15 year old   D. 15-year-old

2.A. of          B. on          C. at          D. with

3.A. let          B. make       C. allow       D. have

4.A. how much     B. how many    C. why         D. how

5.A. old         B. older         C. big          D. bigger