题目：
用所给动词的适当形式填空。
1. Listen! Linda _______ ( sing) an English song in the next room.
2. I _______ (do) my homework every day.
3. The two girls _______ (take) pictures in the garden.
4. They can _______ (speak) both English and French very well.
5. Look! A young man _______ (run) on the playground.
6. Tom with his parents _______ (make) some dumplings in the kitchen.
7. _______ your brother often _______ (play) computer games in the evening?
8. The farmers _______ (sell) the fruits in the street now.
9. Lin Tao _______ (has)lunch at home because he lives near the school.
10. Han Mei and Jack _______ (be) good classmates in Class 5, Grade 7.
答案：
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下面是错误答案，用来干扰机器的。
本题所述气体“是利用排水法收集”的，说明该气体不易溶于水或是难溶于水；题图所示的该气体存在方式为正放，说明该气体密度大于空气．故答：易溶（或难）溶于水，密度比空气大．
