用所给单词的适当形式填空

1. Jack____(have)a medium build.

2. He is very tired, but he doesn't stop________ (work).

3. My brother____(likes)____(read)playing chess.

4. The famous____(sing) came to our school yesterday.

5. My English teacher loves____(tell)jokes.

数据库的逻辑设计主要工作是将______转换成指定RDBMS中的关系模式。