1. He is a ____(好奇的) boy who is always asking questions.
2. My first painting sold for £25, a small ____(财富) then for an art student.
3. We want to___(保存) the character of the town while improving the facilities.
4. He put a grape into his mouth and ___(吞咽) it whole.
5. Students who fail to meet the____(要求) of the course will fail.