单项选择题

The Space Age _________ in October 1957 when the first artificial satellite was launched by the So- viet Union.

A．initiated
B．originated
C．embarked
D．commenced
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单项选择题
I was halfway back to the cottage where my mother lived _________ Susan caught up with me.
A．when
B．while
C．until
D．though
单项选择题
The old gentleman was a very _________ looking person, with grey hair and gold spectacles.
A．respectful
B．respected
C．respective
D．respectable
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