用所给单词的适当形式填空。

1. Don't spend much energy _____ (make) others happy.

2. Why do many parents keep their children from _____ (go) out after school ?

3. It's necessary _____ ( keep) our classroom tidy and clean.

4. He pretended _____ (is) friendly with me.    .

5. I thanked them for their _____ ( kind) they showed me.

至18世纪仍然影响欧洲文学的一个重要因素是（）。

A.古希腊文学

B.中世纪文学

C.文艺复兴文学

D.古典主义文学