1．You did me a favor I expressed my thanks to you ____________(真诚地)．
2．It was his own ____________(过错)that he failed in the examination.
3．A ____________ (有价值的)collection of painting is on show.
4. A good ____________(关系)between parents may have a good effect on their children.
5．We are quite surprised at that man’s strange ____________(举止)．
