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基本語法 。
1. When he was five, he_________(begin) to  read  and write．
2. If you ask him,he_______(help) you.
3. When water________(become) gas,we call it steam.
4. We________(have)a ball game if it is fine tomorrow.
5. As soon as water boils,it________(change) into vapour  little by litle.
.l. began   2. will help   3. becomes   4. will have   5. will be changed
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