题目内容
The great progress they have made comes from their good ____________ work.
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On Halloween, American children go “trick or treating” to get small gifts of ____________ and chocolates.
It's hard for us to know how much ____________ they have put in China's Space Program.
The organizer has ____________ a number of famous singers to perform at the opening ceremony (开幕式).
Exercise will always give you a good ____________.
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