-What's your favorite in your spare time, Jack?- Writing stories and articles ______ what I enjoyed most.
A. is
B. was
C. were
D. are
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-Are the new machines working?- Yes. Three million tons of coal _____ exploited every year in the city.
A. is
B. are
C. has
D. have
I have finished a large part of novel written b Dickens, the rest of which______ very difficult.
A. is
B. are
C. waa
D. were
The great writer and professor _____, who ____ very strict with his students.
A. is an old man; is
B. are both old men; are
C. is an old man and a young man; is
D. are two Chinest; are
A large number of students in our school ______ from the countryside; the number _____ growing these years.
A. is; has been
B. are; has been
C. is; have been
D. are; have been