单项选择题

Certainly man must______the future, and find ways of providing for his use.

A．look to
B．look up
C．look for
D．look on
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单项选择题
I have omitted many things which______a place in the book.
A．reserved
B．deserved
C．preserved
D．observed
单项选择题
Don't rest on your laurels;______your success and start looking for new mar kets now.
A．add up
B．follow up
C．work up
D．count up
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