根据句意,用恰当的介词填空
1.whatarethedoughtthecomingvacation
2.Myuncleishikingthemountainthisfriday
3.mybestfriendsentmethesephtotshongkong
4.l’llshowyouhowtodoitwhenlgetbackschoolformSanfrancisco
5.cathy'sfatheisgoingtoHawaiiDecember4th
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