What are they interested in
A. Playing basketball.
B. Playing tennis.
C. Taking photos.
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— How many times have you been to America — It’s the second time I ______ there.
A. was
B. am
C. have been
After supper my father read the newspaper, ______ my grandma listened to him carefully.
A. and
B. or
C. but
某生物碱的碱性强，则它的
A. ka大
B. Kb小
C. pKb大
D. pKa大
E. pKa小
I ______ my bedroom already. It is very clean now.
A. cleaned
B. have cleaned
C. clean
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