He______taking a little walk when he saw the boy fall into the river.
A. happened to be
B. happened to
C. was happening
D. happened
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The peasants wanted to______with the businessman for some salt.
A. quarrel
B. barter
C. ask
D. change
I saw a man running out of the room______a knife in his hand.
A. having
B. have
C. with
D. to have
He______a ticket because he drove past a stop sign.
A. gave
B. had given
C. was giving
D. was given
It______that light music keeps people form becoming sleepy at their work.
A. found
B. has been found
C. has found
D. finds
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