填空题

Sleep, rest and (relax)（）are the best remedies for many headaches.

【参考答案】

relaxation

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单项选择题

Why did the man think the professor would be angry with him（）

A．Because he failed the exam for a few times.
B．Because he had been late in turning in his homework for a few times.
C．Because he spent too much time on his part-time job.
D．Because he didn’t work har

填空题

If we (know)（）the basic principles, we should have controlled the process even better.