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________ 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

—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

One of our rules is that every student ________ wear the school uniform while at school.

A．might B．could

C．shall D．will

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

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

—May I smoke here?

—If you ________， choose a seat in the smoking section.

A．should B．could

C．must D．may

No matter how healthy you ________ be, you need to consult a doctor from time to time.

A．should B．will

C．must D．may

We all know that we ________ our carbon footprint, but I suspect that many people wouldn't be prepared to go as far as Joan Pick, a retired scientist living in south London.

A．must have reduced B．should have reduced

C．may have reduced D．could have reduced

Brain, like muscles, also needs some kind of exercise and nutrition. The more you use your brain in the right direction, the more you ________ enhance your ability.

A．could B．might

C．shall D．will

—Mum, I'm tired.

—Well, if you ________ go to bed after midnight every night, what do you expect?

A．will B．may

C．should D．can