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單項(xiàng)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(xiàng)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(xiàng)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