单词拼写。

1. C______ on your success last night!

2. He b_______ down and came up with a $20 bill." Sir, you must have dropped this." The waiter said.

3. Every year thousands of college g______ crowded in the job fair, hoping to find their desirable jobs.

4. I'm very c______ about my son in his new school, for he never knows how to take care of himself.

5. He could have finished it on s_______, but somehow he fell behind.

6. In the past, the villagers t_______ their goods by goat not by truck.

7. They built s______ for the homeless children.

8. Though I haven't met him for many years, I could r_____ him immediately when I saw him.

9. He was c_______ along the street when he was knocked off his bike.

10. Some animals hibernate (冬眠) under snow, because there is much air in l_____ snow.