根据句意或首字母填空，每空一词。
1. He's on duty (值日) today. He n_____ to clean the desk.
2. He is always ill. We call him a _____ boy. Now he is ill in the h_____.
3. The boy was w _____that he would fail the exam.
4. —L_____! She is_____ her bike in the street.
—Sorry, I can't s_____
5. —Thanks a lot.
—_____ _____ = _____ _____ _____.
