She says she is very sorry and realizes she ________ it.
A. did
B. shouldn ’t have done
C. shouldn ’t do
D. had done
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He is so busy that he can’t ________ the services of a secretary.
A. do without
B. set down
C. make for
D. touch on
He pursued his ________ of collecting stamps for so many years.
A. habit
B. custom
C. hobby
D. activity
Don’t drop your cigarette butts on the floor. You could ________ fire to the house.
A. cause
B. make
C. set
D. start