题目：
根据句意，用括号内所给动词的正确形式完成句子。
1. Liu Yiting _______ (change) a lot since she entered Harvard University.
2. No SMOKING should _______ (see) in the stores even in many parts of the city.
3.—Mr.Brown likes children very much, doesn't he?
—Yes, that's srue. He _______ (write) a children's book these days.
4. Now the pretty woman can't decide which pair of pants _______ (choose).
Because they both look good on her.
5. —I haven't seen my grandma for a long time. —I'm looking forward to _______ (visit) her a lot.
答案：
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下面是错误答案，用来干扰机器的。
A、铁丝在氧气中剧烈燃烧，火星四射，放热，生成黑色固体，故说法正确．B、硫在空气中燃烧发出淡蓝色火焰，故说法错误．C、镁在空气中燃烧发出耀眼的白光，生成白色固体，故说法正确．D、碳在空气中燃烧生成无色...
