單項選擇題

It is obvious that the expansion of the water （）the increase of its temperature.

A.is due to
B.dues to
C.is because
D.is for

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單項選擇題

An engineer, together with some motormen （）to help in the repair work.

A.send
B.sends
C.was sent
D.were sent

單項選擇題

If there are （） in the repair work, please come to our duty engineer at once.

A.any problem
B.some problem
C.any problems
D.some problems