题目内容：

用括号里所给词的适当形式填。每空一词。

1.When did your sister get _________(marry)?

2.Air _________（pollute）has become a serious problem.

3.The song “Memory” has been popular since the_________(twenty) century.

4.It’s _________(bore) to see the same channel.

5.Our classroom is at the _________(south) end of our school.

6.Bob loves water sports, such as swimming and _________(sail).