【推荐1】This piece of music is much ________ (smooth) than that one.

【推荐2】It is the __________ (smooth) cat that my mother has ever bought.

【推荐3】The water in the lake is as ________ (平坦的) as glass.

【推荐1】根据下列句子及所给单词的首字母写出所缺单词。(每空限填一词)
1. There are f________ people on the street because it is raining heavily.
2. There are different kinds of animals on the Earth. Some are l_________, some are small.
3. Animals are our friends. We should not k_________ them.
4. Our teacher asks us to write a r________ about doing voluntary work during the school holidays.
5. No one tells me the f_________, so I don't know he tells a lie.
6. We must p_________ the Earth. It is our home.

【推荐2】Some animals are ________ (danger).

【推荐3】You are supposed to be r__________ for your action.