—May I smoke here?
—If you ________， choose a seat in the smoking section.
A．should B．could
C．must D．may
We can't use it to tie the goods because it ________ be broken at the weakest position.
A．shall B．may
C．can D．would
If the island ________ a tourist attraction, last week's earthquake would have caused far more deaths.
A．remained B．would remain
C．has remained D．is to remain
One of our rules is that every student ________ wear the school uniform while at school.
A．might B．could
C．shall D．will
—Why does Thomas speak through every discussion but never listen to the others?
—That's what he ________ do. We used to hate that, but are used to it now.
A．ought to B．can
C．will D．might
________ the arrival of the police, I would have been robbed by two masked men.
A．Had it not been for B．If it were not for
C．Had it been not for D．If it would not be for
