根据提示或句意写出所缺单词。
He is ____________(自信) enough to pass the exam.
We can ___________ (支持) the poor children by donating books to them.
I wasn’t ___________ (期望) you to help me.
It was an unhappy but __________ (必要) thing to do.
You need to receive two day’s _______(培训)before you work as a teacher here.