补全对话
A：____
B：Winter.
A：Why?
B：____ And Christmas is in winter, too.
A：What do you often do in winter vacation?
B：____
A：When do you get up in winter vacation?
B：____
A：When do you go to bed?
B：____
A．Because I like winter vacation.
B．Which season do you like best? C．At 7：00 a．m. D．At 9：00 p．m. E．I often play basketball with my brother. |
；③
；④垂直于同一条直线的两条直线必平行吗？⑤一个数不是合数就是质数；⑥把门关上．