I think it unnecessary to go back there，（）we have visited these places.

Whenever he has trouble in study，he always tries，（），to get help from his teachers and classmates.

A.somehow
B.anyhow
C.no matter how
D.anyway

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After the bell rang，the teacher began to pass（）papers to the anxiously waiting students.

A.away
B.out
C.through
D.by

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