15. look after     v.  照顾;照看
例句:John's mother told him to look after his younger brother.
约翰的母亲告诉他好好照顾弟弟。

16. environment    n.  环境
例句:An unhappy home environment can affect a child's behaviour.
不愉快的家庭环境能影响儿童的行为。

17. pollute        v.  污染
例句:Garbage pollutes our rivers and lakes.
垃圾污染我们的河川湖泊。

18. pollution      n.  污染
短语:the pollution of our beaches with oil 石油对我们海滩的污染

19. land            n. 陆地;大地
例句:There was not much land to cultivate in the village.
那村里可耕作的土地没有多少。

20. keep           v. 保持
例句:She has kept all the letters from him.
她把他的来信全保存起来。

21. pick up         捡起;拾起
例句:The children picked up many sea shells at the seashore.
孩子们在海边拾到很多贝壳。

22. into           prep.  到…里面
例句:Throw it into the fire.
把它扔进火里。

23. rubbish bin    n. 垃圾箱
例句:Put the carrot peelings in the rubbish bin.
将胡萝卜皮放到垃圾箱里。

24.leave            v.  留下
例句:People had to leave their towns and villages.
人们只好离开他们的城镇和村庄。

25. promise        v.  承诺;保证
例句:She promised me a reward. = She promised a reward to me.
她答应给我报酬。

26. discuss        v. 讨论
例句:They discussed how to solve the problem.
他们商议如何解决该问题。

27. reuse          v. 再利用
短语:reuse an old envelope 使用旧信封