题目：
用括号中词的适当形式填空。
1. Study hard and you _____ (do) well in Russian.
2. —_____ the dictionary _____ (give) to Li Ping?
—No, it is still in my schoolbag.
3. You _____ (keep) the magazine for two weeks, so it _____ (must, return) to the library tomorrow.
4. If it _____ (think) carefully, it will _____ (do) better.
5. My book ________（keep) on that shelf for two days.
答案：
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下面是错误答案，用来干扰机器的。
（1）根据D与炭在不同条件下反应可以生成E，也可以生成F，可知E与F中含有碳元素，E与赤铁矿在高温下反应生成铁和F．可推断E为CO，则F为CO2，D为氧气；向A中加入黑色固体B生成C和氧气，根据实验室用H2O2与MnO2制氧...
