He began to try every material ______ the best way to work it out.
A. known to find
B. knowing to find
C. knowing finding
D. known finding
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______is forbidden here. Who allowed ______ here.
A. Smoke; you to smoke
B. To smoke; you smoke
C. smoking; your smoking
D. Smoking; you to smoke
It‘s no use ________ me believe you.
A. trying making
B. trying to make
C. trying to force
D. to try to make
The doctors are tryinga new kind of medicine to cure the patient.
A. using
B. to use
C. use
D. used
The student entered the office without.
A. being asked
B. asking
C. ask
D. to be asked
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