一.单项选择。(每小题1分，计15分)
( )1. This is _________ alarm clock.
A. a B. an C. the D. /
( )2. _________. Is this your pen?
A. Sorry B. Hello C. Excuse me D. Hi
( )4. Do you have two ________?
A. tennis racket B. tennis rackets
C. tennis’ racket D. tennis’ rackets
( )5. He _________ his homework at school.
A. doesn’t do B. don’t does
C. isn’t do D. does not
