单项选择题

______ arriving at the burning building, the fire fighters at once joined the local residents in the fight against-the big fire.

A．On
B．For
C．At
D．In
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单项选择题
It is because English is being widely used at present ______.
A．why we learn it hard
B．that we learn it hard
C．which we must learn
D．when we should learn
单项选择题
Having no money but ______ to know, he simply said he would go without dinner.
A．not to want anyone
B．not wanting anyone
C．wanted no one
D．to want no one
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