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
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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
I think it was your Dad ________ phoned.
A. what
B. which
C. whom
D. who
Scarcely had the speaker begun to talk ________ there were laughs.
A. then
B. than
C. when
D. and