单项选择题

When you are travelling ______, you often need to stay in a hotel.

A．if on business or for pleasure
B．whether on business or for pleasure
C．whether business or pleasure
D．on business or pleasure
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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
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
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