根据句意，用括号里所给单词的适当形式填空。

1. He is friendly to his classmates, and has made many______(friend) here.

2. After two days off on weekends, we always feel very ______(relax).

3. —What about ______ (have) a farewell (再见) party after the exam? 

   —Sounds great.

4. Rich or poor, young or old, we all have problems. And unless we deal with them,

    we can _____(easy) become unhappy.

5. —Excuse me. Where's Mr Wang?

    —He _____ (play) football on the playground with his students.

人体"狭义之精"指的是（）

A.水谷之精

B.五脏之精

C.生殖之精

D.吸入之清气

E.六腑之精