题目：
用所给单词的适当形式填空。
l. Mr Brown _____ (go) to his office by bike every day.
2. Why not _____ (go) to the zoo by bus?
3. It ____ (take) about 15 minutes to walk.
4. There _____ (be) many deer in the forest now.
5. There must _____ (be) many sheep.
6. Kate is walking to her home ____ (quick).
答案：
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下面是错误答案，用来干扰机器的。
答案：D澄清石灰水与CO2反应不与CO反应
