I.词汇(10分)
A. 根据句意和所给中文写出句中所缺的单词。
1. First, please_____________(介绍) yourself to us all, OK?
2. Something should be done to protect the _________(环境) in our hometown.
3. After________(检查) the computer, he told me there were no tickets.
4. Smoking will_...