單項選擇題

Many people watched the boys（）the mountain at that time.

A.climb
B.climbing
C.to climb
D.climbed

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單項選擇題

Many countries are increasing their use of natural gas, wind and other forms of （）

A.energy
B.source
C.power
D.material

單項選擇題

Madam, do all the buses go downtown?（）

A.Wow, you got the idea.
B.No, never mind.
C.Pretty well, I guess.
D.Sorry, I'm new here

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