单项选择题

This morning when I was walking to my office, I ______ to see an old friend of mine near the office building.

A. occurred
B. happened
C. managed
D. settled
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______ the population is too large, the government has to take measures to control the birth rate.
A. Although B. Since
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Mr. Black is looking forward to ______ his Chinese partner soon.
A. seeing
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