根据句意及首字母或括号内汉语提示写出所缺单词的正确形式。 1. Something ____________ (闻、闻起来) terrible. What goes bad in the kitchen? 2. This is a ____________ (私人的) letter, and you can’t open it. Please remember it. 3. Betty has lived in Guilin ____________ (自从……以来) she came to China. She loves it very much. 4. Tom is a good young man. His boss ____________ (派遣) him to Shanghai to work last month. 5. We have only one earth. It’s too important for us. So we must try our best to make our ___________ (环境) much cleaner.