Fifteen minutes ____ all that I can spare to talk over this matter with you.
A. is
B. are
C. were
D. be
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Small as it is, the ant is as much a creature as ____ all other animals on the earth.
A. do
B. are
C. is
D. have
Many a man ____ Beijing Opera in China.
A. enjoying
B. to enjoy
C. enjoy
D. enjoys
The number of pages in this book ____ 900.
A. are
B. were
C. is
D. was
Not only all the planets but also the sun ____ in constant motion.
A. are
B. were
C. be
D. is