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 ______.
