一、 根据中英文提示或句意完成单词。
1. The ______________(扬声器) can be put in t he four corners of the hall.
2. I’m thinking about how to ______________ (安排) the things in the school hall for the charity show.
3. It’s our ______________ to protect our environment.
4. Mr Smith holds a ______________ (something makes the sound louder) to give us a talk.
5. What a beautiful ______________ Han Hong has! We all like her songs.