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At --2:00, at breakfast, at midnight, at the moment, at the weekend, at Easter, ,at ten o'clock,at Christmas ;
On--on the 22nd of June, on Monday, on your birthday, on the 13th of September,on the 7th of June, on Thursday, on the 1st of May;
In --- in February, in 1999, in the winter, in the afternoon, in 2001,in the rainy season, in two years time, in winter,in January, in 1930, in the summer.