單項選擇題

Every precaution must be taken to avoid （）.

A.sparking being taking place
B.to spark taking place
C.sparking to be taken place
D.sparking taking place

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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

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

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