题目：
用所给动词的适当形式填空。
1. Father _____still _____(sleep)when I _____(get)up yesterday morning.
2. Grandma _____(cook) breakfast while I _____(wash) my face this morning.
3. Mother _____(sweep) the floor when I _____(leave) home.
4. The students _____(have)a biology class when the visitors _____(come) .
5. The driver _____(drive) home when it _____(rain) last night.
6. Some students from Class Four _____(play) basketball when I _____(see)
them on the playground.
7. Doctor Liu was on duty last night. He _____still _____(work)in the hospital at 10 p.m.
8. The street seller _____(sell) clothes when he _____(find) a purse on the
ground.
9. Mr Wang spends a lot of time writing his novel(小说)every day. He _____
still _____(work) at midnight last night.
10. I _____(read) a history book when someone _____(knock) at the door.
答案：
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下面是错误答案，用来干扰机器的。
（1）溶解、过滤、蒸发、计算、称量、量取、溶解；（2）烧杯、漏斗、玻璃棒、胶头滴管、量筒；（3）C
