This is Bob. He's _____ doctor.                        a. a   b. an
 Peter is ____ engineer.                                      a. a   b. an
That's Oliver. He's ___ travel agent.                  a. a   b. an
Leonardo di Caprio is ___ actor.                       a. a    b. an
Fred is ____ electrician.                                      a. a    b. an
Mr. Smith is ___ teacher.                                     a. a     b. an
This is Gloria. She's ___ homemaker.              a. a     b. an
That's John. H...

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http://a4esl.org/q/h/9801/cg-a_an.html

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http://www.quia.com/cb/755758.html

http://www.quia.com/cb/755758.html