单项选择题

Something must be done. There will not be enough space even to stand ______ the earth.

A．in
B．on
C．in on
D．on in
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Where does this dialogue probably take place
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B． In a company.
C． In a hospital.
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How will the man be paid
A． By the hour.
B． By the week.
C． By the month.
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