单项选择题

Scientists and economists (believe) that human being (can never) (use away) all the (mineral) resources on Earth.

A．believe
B．can never
C．use away
D．mineral
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(Only) (in this way) (we can) (win the match).
A．Only
B．in this way
C．we can
D．win the match
单项选择题
I owe you some money. Let me pay you ______ now.
A．back
B．for
C．in
D．to
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