题目内容：

根据句意及汉语或首字母提示，填入恰当的单词。

1.March is the best time to p______ trees.

2.Look！There are many birds flying in the s______.

3.The market is very c_____because there are too many people shopping there.

4.How many________(公寓)do your parents have?

5.A noisy room is not the best________(环境)to work in.