下列句子均有一处错误,挑出来并改正.
1.MaryhasmostfriendsthanAliceandAnn.
____________________________________
2.Youmustdancegoodifyouwanttobefirstplace.
___________________________________________
3.Tomboughtthemanypencilsofthethree.
___________________________________
4.Mickdidhisbetterinthehighjump.
_________________________________
5.Kateis9yearoldthisyear.
_________________________________