题目内容：

根据句意并用括号内所给，单词的适当形式填空，使句子完整、正确。

1.Look at the clouds. I think it ____________ (rain).

2.Our classroom is on the ____________ (three) floor in that red building.

3.—Who is the boy with you? —He is a good friend of ____________ (I).

4.The computer doesn’t work. Let’s ask someone ____________(fix) it, shall we?

5.It takes me about an hour ____________ (buy) some presents for my family and friends.