单项选择题

It has been proved that it ______ to invest more in education and science research projects.

A．pays
B．costs
C．takes
D．gets
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单项选择题
I am ______ about going home for the summer vacation.
A．out of mind
B．in two minds
C．on my mind
D．out of my mind
单项选择题
Although the pay is not good, people usually find social work ______ in other ways.
A．grateful
B．payable
C．respectful
D．rewarding
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