Read and fill.
阅读下面的对话，根据上下文的内容填入所缺的单词，使对话意思合理、完整，每空只填一词，注意字母大小写、缩写的规范要求。（每空1分，共10分）
（1）A: _____ he playing chess?  B: No, he ______. He’s counting leaves.
（2）A: _________ do you do morning exercises?  B: I do morning exercises _____ 8:00.
（3）A: _______ season do you like best?  
B: I like __________. Sometimes it’s cold, but I can plant trees and the flowers are beautiful.
（4）A: ______ is Zhang Peng doing?  B: He’s _________ dinner.
（5）A: _______ do you like fall?  B: Because my birthday is ____ fall.