单项选择题

Human beings cannot exist without air.

A. live
B. breathe
C. exercise
D. grow
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Even though his parents wanted him to become a doctor, Peter, chose his vocation as a writer.
A. vacation
B. profession
C. work
D. variety
单项选择题
On behalf of everyone in this party, I wish you a very happy birthday.
A. Presenting
B. Assisting
C. Representing
D. Cheating
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