根据对话内容填入适当的单词补全对话，使句义完整，符合逻辑，每空限填一个单词。
A: 1. in the room?
B: There are some kinds of robots made by the students in our school.
A: Really? What are they 2. for?
B: The one with blue eyes is a guide robot. She can show you around our school.
A: 3. about the taller one?
B: He is a cook robot. He can cook something nice for you.
A: Oh, I think that's a cleaning robot.
B: Maybe you're right. When he finds waste things, he'll pick them up. He can 4. our environment clean.
A: That's wonderful! What good students! I'm proud of them.
B: So 5. I.