I have _____________ (一位美术老师).
[     ]
A. a art teacher
B. art teacher
C. an art teacher
He is _____________ university student.
[     ]
A. /
B. an
C. a
Miss White is ____________ English teacher.
[     ]
A. a
B. an
C. /
He is ___________ principal.

[     ]

A. an
B. a
C. the
There is _____________ air-conditioner on the wall.

[     ]

A. a
B. an
C. the
Is there ____________ (一条河)?

[     ]

A. river
B. a river
C. a lake
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