用合适的词填空 求回答.

题目

用合适的词填空 求回答.
He does well _____ skating and he often helps the children____ skating,too.
It is careless ___ you____make such a mistake.
He sits ______ the chair _____ a smile _____ his face.
It is very hot here.Please take _____ your coat.

答案