根据句意和所给中文写出句中所缺的单词。
1. May I __________(介绍) my best friend Amy to you, Sandy?
2. I think it’s our_________(职责) to protect the environment.
3. The cinema has________(出口) on its three sides.
4. Will you please pay________(注意力) to what I am saying?
5. How many __________(客人) were there in yesterday’s party?