根据句意和所给中文写出句中所缺的单词。 1. First, please ___
题型：填空题
问题：
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 _________ (当然) do harm to your health.
5. There will be an exciting football match between China and Japan on _________ (频道) 5 tonight.