She was so tired that she took _____ two-hour rest.
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Can you lend me_____ pencil so that I can finish the test?
A. a
B. an
C. the
D. X
He bought _____ new pair of reading glasses.
A. a
B. an
C. the
D. X
This is the first time that the child has seen _____ elephant.
A. a
B. an
C. the
D. X
For many people，_____ childhood was not a happy time.
A. a
B. an
C. the
D. X
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