A cook will be immediately fired if he is found _______ in the kitchen.
A. smoke B. smoking
C. to smoke D. smoked
（题文）Don’t leave the water_______ while you brush your teeth.
A. run B. running
C. being run D. to run
The salesman scolded the girl caught ______ and let her off.
A. to have stolen B. to be stealing
C. to steal D. stealing
He looked around and caught a man his hand into the pocket of a passenger.
A. put B. to be putting
C. to put D. putting
It was so cold that they kept the fire ______ all night.
A. to burn B. burn
C. burning D. burned
Though I have often heard this song ______, I have never heard you ______ it.
A. being sung; sang B. sang; singing
C. sung; sing D. to be sung; to sing
