Colour-blind people have difficulty ________ between blue and green.
A. separating
B. comparing
Contrasting
D. distinguishing
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I think that the three months in the country have ________ us a lot of good.
A. made
B. to do
C. gone
D. done
Jane said it had been foolish ________ me to make such a mistake.
A. to
B. for
C. of
D. about
If you are not interested in what I’m doing, you ________ leave.
A. may better
B. may very much
C. may just as well
D. may be well to
You __________ that office building after dark.
A. have no business for entrance
B. have no business entering
C. have not the business to enter
D. do not have business to entering
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