单项选择题

Edison never stopped ______ new and better ways to do things.

A．to search for
B．to search
C．searching for
D．searching
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单项选择题
If you walk fast for 30 minutes every day, how many calories will be used for one week
A．100.
B．700.
C．1,400.
D．200.
填空题
Can you help me to get those letters (mail) ______
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