题目内容
The ______ to staying in that dead-end job is to quit.
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Politicians and big companies believe ______ are alternative sources of energy
Brazil is the world’s second largest producer of ______.
The Amazon is a moist broadleaf forest that covers most of the Amazon basin of _______.
A biofuel is a fuel that is produced through contemporary _______ processes, rather than a fuel produced by _______ processes.
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