1. 根据句子意思，用括号中所给词的正确形式填空，每空填一词。

1. （1） Lang Lang is a (天生的) pianist and of course, his hard work also helps him achieve such great success.

3. （2） Jim's father is a (总的) manager in a big computer company.

5. （3） Li Hong came first in the 100-metre (赛跑) in the sports meeting last week.

7. （4） The young man is trying to be a (先锋) in the field of high technology.