【推荐1】My teacher says it is very important ________ (sleep) well before an exam.

【推荐2】根据句意，用括号中所给词的适当形式填空，并将答案写在答题卡的相应位置上。
1. It’s ____________ to talk with your mouth full.（polite）
2. Edison was a great ____________. (invent)
3. The old man made a living by ________________old thing. (sell)
4. I have been to Lijiang ______________. I think it’s really beautiful. (two)
5. They are old enough to look after ______________. (they)

【推荐3】It’s important ________ (save) the animals in danger.