根据短文内容，用恰当的反身代词填空

Yesterday my sister Tonia and I went to the shop to buysome ice-cream．On the way home，Tonia fell down and hurt and I cuton some broken glass．When we got home，my brother and his friends were enjoyingplaying in the garden．My brother shouted，“Look at ”，and he began to laugh at us．I couldn't know why．When we looked at in the mirror ,we saw why．Our faces were covered with ice-cream．