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單項選擇題

A moving object will not accelerate or decelerate （）a force is applied to it.

A.whether
B.if
C.unless
D.till

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單項選擇題

When was your ship built? （）is a new oneShe was delivered to us by Bremen Shipyard only three months ago.

A.Ours
B.Ours ship
C.Our’s ship
D.Our’s

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