单项选择题

The company's training plan was designed to help the employees to improve their work habits and ______.

A．proficiency
B．sufficiency
C．insufficiency
D．efficiency
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单项选择题
To get my traveler' s cheques I had to ______ such a special cheque to the bank for the total amount.
A．make for
B．make out
C．make up
D．make over
单项选择题
The laser represents a true marriage between science and technology, the men who devised it were ______ engineers and physicists.
A．spontaneously
B．simultaneously
C．instantaneously
D．homogeneously
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