On

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On

1.Are you free on Friday? A new sci-fi film is on at the Cinema.—Really?（）, but I’m busy on Friday.2.On Forrest's first day to go to school, why did other kids refuse to offer a seat to Forrest?3.自燃点较高的异辛烷的o.n为（）。4.On Mother's Day, people （）.