12.Our teacher has_______ Australia for a week.
A. gone to
B. been in
C. arrived
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-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
.Thanks___ your help. I have made progress.
A. for
B. of
C. with
-Many young people usually offer their seats to the old on the bus.-That’s good. The old should be ______.
A. looked for
B. listened to
C. depended on
D. cared for