居民们签署了一份请愿书，要求市政府改善公园设施。
The residents signed a ___petition asking the city government to improve park facilities.
他恳求老师再给他一次机会。
He ___petitioned the teacher for another chance.
居民们正在请愿要求政府改善公园设施。
The residents are ___petitioning the government to improve park facilities.
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