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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单项选择题
I can't help (to think) it (would be) fun (to play) such (an exciting) game with them.
A．to think
B．would be
C．to play
D．an exciting
单项选择题
(Nothing) (but) two chairs (are) (in) the room.
A．Nothing
B．but
C．are
D．in
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