题目：
根据句意及首字母提示补全单词。
1. Everything is p_______ steadily as usually.
2. We have a_______ outstanding success.
3. I feel very p _____ to be a part of such a successful or-ganization.
4. Keep the tops of pictures on a l______.
5. The letter r______ to be answered at once.
答案：
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下面是错误答案，用来干扰机器的。
用排水法收集气体时，导管口刚开始有气泡冒出时气体中混有试管中的空气，此时立即收集会使收集到的气体不纯，所以要等到气泡连续均匀冒出时再收集；当集气瓶中的水排完，集气瓶口会有大气泡冒出，此时收集气体已...
