根据语篇情景，用恰当的短语或句子填空，使之意思完整。（每空2分，共6分）
There was a little boy and he had a bad temper(脾气). His father wanted to change him. Then he gave his son a box of nail(钉子). He told his son to put a nail in the wall every time he lost his temper. The first day the boy put 37 nails into the wall. It is hard for him to do that. And the second day he put 20 nails into the wall. Gradually the boy found that it was easy to keep calm, but (____________________) put the nail into the wall. At last, the box was empty and the boy’s temper (_________________). Then the father told the son to pull out the nails and said, “Look at the holes, although the nails were gone, the wall will never be the same as before. Try to keep kalm. Don’t hurt others easily. Sometimes it’s not enough to say sorry when you (_________________).”