选择括号内恰当的单词或词组填入空白处，使句意完整、正确。（5分）

1.Are you going to               （join / take part in）the school rowing club?

2.I think the computer is               （used / useful）.

3.I spent two hours                （sweep / sweeping）the house yesterday.

4.The house is so expensive that I can’t               （share / afford）it.

5.Even scientists aren’t sure               （if / whether）or not there are UFOs.

Why don’t you _____ us to _____ the speech contest?

A. join, join          B. take part in, take part in

C. take part in, join       D. join, take part in

选择括号内恰当的单词或词组填入空白处，使句意完整、正确。（5分）
【小题1】Are you going to               （join / take part in）the school rowing club?
【小题2】I think the computer is               （used / useful）.
【小题3】I spent two hours                （sweep / sweeping）the house yesterday.
【小题4】The house is so expensive that I can’t               （share / afford）it.
【小题5】Even scientists aren’t sure               （if / whether）or not there are UFOs.

选择括号内恰当的单词或词组填入空白处，使句意完整、正确。

86．Are you going to               （join / take part in）the school rowing club?

87．I think the computer is               （used / useful）.

88．I spent two hours                （sweep / sweeping）the house yesterday.

89．The house is so expensive that I can’t               （share / afford）it.

90．Even scientists aren’t sure               （if / whether）or not there are UFOs.