单词拼写（共10小题；每小题1分，满分10分）
This examination is a real ______ (挑战).
He wanted to ______ (捐献) half of his savings to the relief fund.
The United Kingdom ______ (由……组成) of Great Britain and Northern Ireland.
You must get rid of the bad habits your ______ (原先的)piano teacher taught you.
He is an ______ (乐观的) person, and we all like him.
She decided to ______ (控告) him of stealing her watch.
We regret to ______ (通知) you of the cancellation of the tour.
This is a deadly ______ (毒药). We must be cautious.
It is ______ (典型的) of him to be late for class.
The prisoner made an ______ (试图) to escape, but failed.