Mary, what's this ____ Chinese?
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Last week, I went to school ______.
A. by the bus
B. by bus
C. on the foot
There was no airline _____ the two cities in the old days.
A. among
B. between
C. in
What time did Mrs. King come back?---____ nine o'clock yesterday morning.
A. On
B. In
C. At
Students needn't go to school ____ Sundays.
A. on
B. in
C. at