My brother is not old enough to go to school.

1. A.
   so young
2. B.
   too young
3. C.
   quite young
4. D.
   very young

My brother is three years ________ than I. He is ________ young ________ go to school.

A. young; too; to

B. younger; enough; to

C. younger; too; to

D. young; so; that

(用所给单词填空) My brother is too young _________ (go) to school．

　　Today is Sunday. My friends Lin Bin, Wang Xiaoming, Bei Feng and other two boys ask me to go swimming with them. Soon we get to the river. They are swimming in it, but I can't. So I'm sitting under a big tree and watching a little girl playing with a ball by the river. But the ball falls into（落入）the water and soon she falls into the water, too.

　　I'm standing up and calling for help, but my friends are far（远）from me and they can't hear. So I jump into the river. I don't know how to swim in it, but I take the girl out of the river. Her parents thank me very much. They say, “You are a good boy, a good Young Pioneer.”

　　When my friends know this, they all smile and say, “You can swim now.”

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(5)The good boy is calling for help because（因为）________.

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