把下列句子变为相应的复数或单数。

1. This is a red bus.

_______________________________________.

2. I'm a good teacher.

_______________________________________.

3. Is that an orange?

______________________________________?

4. Where are their skirts?

______________________________________?

5. Do they have some new bikes?

______________________________________?

6. The boy doesn't like its color.

______________________________________.

根据《消防法》第四十四条规定，发生火灾时有关单位有（）责任。

A.发生火灾的单位必须立即组织力量扑救火灾

B.临近单位应当给予支援

C.临近单位应当给予发生火灾单位经济援助

D.发生火灾的单位必须给志愿参加灭火工作的人员经济报酬