单项选择题

How much does it______to take the online training course

A. cost
B. give
C. pay
D. spend
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单项选择题
Short sight can be ______ by the use of suitable glasses.
A. fixed
B. improved
C. reduced
D. corrected
单项选择题
Our company's service is ______ in nearly 80 countries around the world.
A. available
B. natural
C. relative
D. careful
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