根据对话内容，从下面方框中选择适当的单词填空，使对话内容完整正确。
Reporter：Can you introduce something about your latest class activity?
Monitor：Sure. The students from our class planted some lines of trees on March 12th, 2008.
Reporter：How did you plant trees?
Monitor：First, the students weredivided 【小题1】care into groups of four. Next, each group of students planted a tree. Then, they poured some water over the trees.
Reported：How do you from time to time 【小题2】problems for the trees?
Monitor： We plan to e back and look after the trees on his own 【小题3】 .
Reported：Sounds good. Could you tell me why you choose to do that?
Monitor：As you know, pollution has bee one of the most serious 【小题4】 . We would like to try our best to improve our environment.
Reporter：Well, it’s very meaningful. If everyone can do something to protect the environment 【小题5】, our city will bee much more beautiful.
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解析：
【小题1】根据句意应该是学生被分成四组。故用be divided into。
【小题2】通过下面答语We plan to e back and look after the trees可以推测，应该是照顾，所以选care。
【小题3】根据句意，可以推断，应该是时间，所以选from time to time （有时，不时，偶尔）。
【小题4】根据句意，pollution has bee one of the most serious 一句，应该是污染已经成为最严重的问题之一。
【小题5】根据句意应该是如果每个人都能为保护环境做点事的话，我们的城市将变得更加漂亮。