从所给的单词中选出合适的完成对话，并将答案写在相应的横线上。

Sam: Hello, Ken. are you doing in your garden?

Ken: I am looking for . I want to make a new toy for my little brother.

Sam: You want to a toy. That's a good idea. Can I help you?

Ken: OK! Let's make it together.

Sam: I want to invent a which can run, play and fly.

Ken: I think it can do housework, . I can use it to wash my clothes.