题目内容
They ________ the developed countries to commit more money to protecting the environment.
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My family _______ on my father's unemployment benefit after he lost his job.
Many subway riders read books or listen to music in order to __________ their time on the way to work.
In order to _________ the physical exercise, you have to exercise regularly, and for at least half an hour each time.
They all tried to talk _________, but I couldn't hear anything they said.
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