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Thanksgiving Day is a traditional harvest festival.It is a time to give thanks __1__ the harvest and express thanks in general.It is a holiday __2__ primarily (主要地) in Canada and the United States.rnIt is said that the Pilgrims set ground at Plymouth Rock __3__ December 11,1620.Their first winter was devastating(毁灭性的).At the beginning of the following fall,they had lost 46 of the 102 persons who sailed on the Mayflower.But the harvest of 1621 was __4___ rich one.And they decided to celebrate with a dinner—including 91 Indians __5__ had helped the Pilgrims survive their first year.