As is known to us all, _____ tiger is in _____ danger of becoming extinct.
A. the, a
B. the, 不填
C. a, 不填
D. 不填, the
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Listen! Some of the girls ______ about Harry Potter. Let' s join them.
A. are talking
B. talk
C. will talk
D. talked
Our teacher, Miss Chen,______ English on the radio the day bore yesterday.
A. teaches
B. taught
C. will teach
D. had taught
I don' t think I _____ you in that dress before.
A. have seen
B. was seeing
C. saw
D. see
Susan' s parents have bought a large house with a swimming pool. It ______be very expensive.
A. must
B. can
C. mustn' t
D. can' t