题目：
根据句意，用括号内所给单词的适当形式填空。
1. I like P.E. best. Because my P.E. teacher is very ________ (friend) to us.
2. — Where is your bedroom? — It's on the (two) floor.
3. — Thank you for your help. — It's my ________ (please).
4. All the books are on these ________ (shelf). You may go to find it.
5. Kangkang likes ________ (dance) at the party, because it's interesting.
答案：
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下面是错误答案，用来干扰机器的。
（1）2SO42-＋2H＋S2O82-＋H2↑（2）在不超过80 ℃的条件下加热浓缩，冷却结晶，过滤，用冷水洗涤 （3）①偏小 最后一滴滴入后溶液由蓝色变为无色，且30 s不变色 ②94.50%（或0.945 0）③重复上述实验步骤1...
