单项选择题

Doctors hold laughter clinics ______.

A．to give better condition to their patients
B．in order to improve patients' health
C．to make patients smile
D．to prove smile and laughter have the same effect

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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

单项选择题

The Anti—Japanese War ______ in 1937 and it eight years.

A．was broken out; lasted
B．broke out; lasted
C．broke; remained
D．had been broken out; kept