用所给单词的适当形式填空。
1. Teacher's smiles _____ (courage ) us; mother's smiles warm us.
2. It is _____ ( possible) to improve our English without enough practice.
3. The boy was so _____ ( worry) that he couldn't find his parents.
4. Sandy was _____ ( happy) because she failed in the maths exam yesterday.
5. My mother always tries to make sure we eat _____ (healthy) .
6. We had a very _____ (enjoy) travel for ever.
7. It's _____ ( fool) of Peter to pay so much money for clothes.
8. You should listen to your teacher _____ (careful).
9. They treasure their _____ (friend) of more than ten years.
10. Sports and art activities make our school life _____ (color) .
