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) .

承销拟公开发行证券的公司票面总值超过( )的，证券经营机构应当组成承销团进行承销。

A．人民币1000万元
B．人民币8000万元
C．人民币5000万元
D．人民币10000万元