根据句义，用括号内所给词的适当形式填空。
1. The old should be spoken to ______ (polite).
2. My family lives in the ______ (center) park of the city.
3. He is too ______ (care) to pass the final exam.
4. Poetry is a beautiful way to express ______ (think) and feelings.
5. Children's ______ (expect) ideas often surprise the adults.
