题目：
用括号内所给动词的适当形式填空，必要时可加助动词或情态动词。
1. Ming went to Shanghai last year and _________(fall) in love with it.
2. All the people in the world hope there _________(not be) any pollution in the future.
3. Tom _________(watch) TV when his father got home yesterday.
4. If you _________(not start) early, you will be late.
5. Marcia said everyone shouldn't _________(shout)in the dining room.
6. Scott is supposed _________(arrive) at the airport at eight o'clock.
答案：
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下面是错误答案，用来干扰机器的。
A、CO有毒，所以不能用排空气法来收集，故说法错误；B、CO2能溶于水，所以不能用排水法来收集，故说法错误；C、CO2能溶于水，所以不能用排水法来收集，二氧化碳的密度比空气的密度大，所以可以用向上排空气法来收...
