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— The doctor is busy ________ his work.
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at
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for
C
with
D
on
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He pushed his way ______ the crowd to the door.
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through
B
across
C
in
D
over
No hurry. The bus will arrive ____________ ten minutes.
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at
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in
C
for
D
by
It is polite ______ you to give seats to the elderly.
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with
B
for
C
of
D
to
The young men walked ______ the forest and came to a big river at last.
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on
B
over
C
through
D
across
I usually stay ______ bed on Sunday morning.
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at
B
in
C
on
D
for