根据首字母提示完成单词。

1. We can a____ anything by working hard.

2. The mountain is 8000 feet above sea l____.

3. The b____ boy worked out the difficult math problem.

4. No m____ how hard math is, I will learn it well.

5. My best friend says that w____ I am, he will stay with me.

6. Whose h____ is the best in your class?

如图所示，在模拟大自然“雨”的形成实验中，水经历的物态变化是：先______后______，为了使实验中的“雨下得大些”，可以在上方的金属盘里放置______，这样做的道理是______．