The guard caught him by ________ arm.
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What’s matter with you?
A. an
B. a
C. /
D. the
——What do you want to be in the future, Allen?——I want to be____pilot. It is ______exciting job.
A. a; an
B. the; the
C. /; /
D. a; the
Next week they will go to Australia by ______air.
A. a
B. the
C. an
D. /
Jumping out of ______airplane at ten thousand feet high is quite______ exciting experience.
A. /; the
B. /; an
C. an; an
D. the; the