单项选择题
A.sparking being taking place B.to spark taking place C.sparking to be taken place D.sparking taking place
It is obvious that the expansion of the water （）the inc...
单项选择题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
An engineer, together with some motormen （）to help in t...
单项选择题An engineer, together with some motormen （）to help in the repair work.
A.send B.sends C.was sent D.were sent
If there are （） in the repair work, please come to our ...
单项选择题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
