Taxi doesn't run as ____ as an underground train.
A. fast
B. faster
C. fastest
D. more fast
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After a long walk, the old man ____ be tired now.
A. can
B. must
C. has to
D. need
A: Is this ____ pocket calculator? B: No. It's ____.
A. your; his
B. yours; his
C. hers; mine
D. his, her
____ great day July 1, 1997 is!
A. How a
B. What a
C. how
D. What
____ human beings ____ animals can live without air.
A. Not only; but also
Both; and
C. Either; or
D. Neither; nor