单项选择题

Riding on the swings (秋千) and (playing) with the ducks in the pond (was) our (children’s) greatest pleasure when we took (them) to the park.

A．playing
B．was
C．children's
D．them
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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
单项选择题
(Only) (in this way) (we can) (win the match).
A．Only
B．in this way
C．we can
D．win the match
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