We are ________ a school trip.
#49706
A
in
B
on
C
at
D
for
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My sister has learnt English        .
#47780
A
for twelve years ago
B
since she was four
C
twelve years ago
D
at the age of four
—How does your father go to work?—He often goes to work __________. 
#48065
A
by a bus
B
take the bus
C
by bus
D
take bus