1. 用方框中所给词的适当形式填空

instrument    painter    engineer     code    backwards

1. （1） Leonardo da Vinci invented flying machines; he was a great .
3. （2） To make it secret, he wrote it in .
5. （3） In order to lose weight, Tom usually stands against the wall.
7. （4） Katherine is a music fan; she likes singing while playing different music .
9. （5） The people who speak out their ideas with drawing are .