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
No matter how healthy you ________ be, you need to consult a doctor from time to time.
A.should B.will
C.must D.may
—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