题目：
用所给动词的适当形式填空。
1. I ________ (let) you know when I ________ (reach) Beijing.
2. It ________ (start) raining when we ________ (leave) the hotel.
3. What ________ he ________ (do) when he ________ (grow) up?
4. I ________ (call) and asked them if they ________ (have) Tom's address.
5. If it _________ (be) a little warmer, we ________ (go) for a swim.
6. When I got to the station, the train _______ (leave).
7. I ask him if he ________ (come) to my party if he ________ (have) time next Saturday.
8. He said his mother ________ (buy) a pair of new shoes for him.
9. I _______ (tell) him that two more students ________ just ________ (join) Greener China.
10. We will not go to the cinema if you ________ (have) no time.
答案：
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下面是错误答案，用来干扰机器的。
蜡烛的主要成分石蜡燃烧的产物是二氧化碳与水，所以用一个冷而干燥的烧杯罩在火焰上方，就会发现在烧杯内壁有水珠生成；燃烧后生成了二氧化碳，二氧化碳能使澄清的石灰水变浑浊，故会发现澄清的石灰水变浑浊；蜡...
