11.The teachers are always comparing me _______my brother.
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-Mike, let’s prepare for our baseball game.-OK. We’ll lose the game ______ we try our best.
A. unless
B. once
C. after
D. since
12.Our teacher has_______ Australia for a week.
A. gone to
B. been in
C. arrived
-Mario, your mobile phone is ringing.-Wait a minute. It’s dangerous for us ______it while crossing the street.
A. answering
B. to answer
C. answer
D. answered
In last two years, we _______ twenty songs.
A. were learning
B. had learned
C. have learned