根据首字母或汉语提示写出单词。

1. In b______ class, we learn much about animals and plants.

2. My classmate, Liu Peng won the first prize in yesterday’s ______ (演讲)contest.

3. Mr. Zhang was______ (缺席)from the meeting yesterday. What happened to him?

4. At p______, people in China are busy building an energy saving(节约型)s_____.

5. As We know, Heroin (海洛因) is a kind of bad d ______.