单项选择题

Don't ______ to let me know if there is anything I can do for you.

A．reject
B．prevent
C．hesitate
D．refuse
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单项选择题
There is ______ that well-educated citizens should devote their knowledge and skills to their own country and people.
A．no deny
B．no denying
C．not deny
D．not denied
单项选择题
______, the new electronic device they designed is now in regular operation.
A．With the solved problem
B．With this problem being solved
C．With the problem solved
D．With this problem to solve
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