根据中文提示写出单词或词组，使句意完整、正确。
1.—Could you please do me a favor? —Sorry. I am ____ (忙的) now.
2.—They are ____ (英雄) in my eyes.  —I agree with you. We should learn something from them.
3.—Too much ____(噪音) can make you deaf.  — I think so.
4.— Long time no see!  — Yeah, I have____  (参观) Japan for three months.
5.— How time flies! It’s June now.   — Yeah, we should try our best to make our dream____ (实现).

一个正多边形的每个内角都是144°，那么这个正多边形的内角和是（   ）

 掌握化学用语是学好化学的基础．请用化学用语填空：

（1）单质铁____ ； 

（2）3个碳原子____ ；

（3）5个水分子____ ； 

（4）硫在空气中燃烧____ ．

____ ____sad.