I found it _______ to work out this math problem in one minute.
A. easy
B. quickly
C. hardly
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There______ many students in the classroom.
A. are
B. is
C. be
We like listening _______ music.
A. on
B. to
C. in
Beijing ______ a beautiful city.
A. is
B. are
C. am
He works______ a factory.
A. in
B. at
C. on