单项选择题

If someone (happens to call) while I'm (out), please have (them) leave a message (for me).

A. happens to call
B. out
C. them
D. for me
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单项选择题
The doctor (told) him that he (should take) this medicine (one) pill at (one) time.
A. told
B. should
C. one
D. one
单项选择题
(A number of) endangered (species) (increases) every year and natural (resources disappear).
A. A number of
B. species
C. representative
D. resigned disappear
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