___ Earth runs around ___ Sun.
A/the
B. An/the
C. The/the
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— What is your mother doing?— She is ___ for the bus.
A. waiting
B. waits
C. wait
___ my parents’ help, I begin to catch up ___ my classmates.
A. With/to
B. Under/with
C With/with
— Do you know the differences ___ the three words?— Sorry, I don’t know.
A. among
B. between
C. with
My family ___ the best one in the world.
A. are
B. is
C. am