在生产装置的空气中苯的最高容许浓度为多少？苯通过什么途径进入人体？（KHD：安全与环保知识）

用所给单词的适当形式填空。

1. The famous          (sing) came co the city yesterday.

2. My English teacher likes          (tell) jokes.

3.This girl is of medium height, and           ( her)  has short hair.

4. That is your__      (friend)  car.  Please look  after it．

5. My mother           (have)a new look now.