根据句意及首字母（汉语）的提示，补全单词。

1. (蝴蝶)can fly 10 kilometers per hour.

2. He was brought up in very difficult_____(情形).

3. Please come here as soon as p_____.

4. Heilongjiang is the n_____province of China.

5. This is a bag_____(装满)with sand.

如图所示，甲容器中盛有水，乙试管内盛有表中的一种液体，在一个标准大气压下，若对甲容器底部持续加热，过一段时问会发现乙试管内的液体发生沸腾，则乙试管内盛的液体是______．