题目内容
From the moment life began on the planet, the climate has swung ________ and often abruptly from one state to another.
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The hymn, the large part of the poem, can be divided ________ into three sections.
They realized that some of their prices were higher than their competitors', and revised prices _________.
He seemed so sure of his decision, how could he flip-flop so ___________ now?
The universe is an __________ vast space filled with planets, stars, systems, nebulae, gas, dust — and it's impossible for us to ever explore it all.
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