根据短文内容，在A、B、C、D、四个选项中选择一个最佳答案。

　　It was a hot afternoon and Tom was feeling sleepy in his English class. It was a grammar lesson . He 41 grammar. He wanted to leave school and work. Tom looked out of the 42 . He looked at the trees and flowers. Then he started daydreaming.

　　After ten minutes the teacher stopped 43 . He asked the students to do some grammar exercises in their books. The students took out 44 exercise books and pencils and they started writing. The teacher looked at Tom. He saw that he wasn’t writing , so he said, “ 45 aren’t you writing, Tom?”

　　“What, sir?” Tom said.

　　“ 46 , don’t have a daydream ,Tom!” the teacher said, “Why aren’t you writing?”

　　Tom thought for a moment and replied, “I aren’t got a pencil.”

　　The teacher looked 47 Tom and said, “You aren’t got a pencil? You mean you don’t have a pencil?”

　　Tom didn’t understand the English teacher, 48 he said, “Sorry, sir.”

　　The teacher said in a(an) 49 voice, “I don’t have a pencil. He doesn’t have a pencil. She doesn’t have a pencil. We don’t have pencils. They don’t have pencils. Tom ,do you understand ?”

　　Tom thought for a while and he said, “My goodness! What happened to all the 50 , sir?”

　　41. A. hated B. loved C. studied D. enjoyed

　　42. A. book B. blackboard C. window D. desk

　　43. A. thinking B. speaking C. shouting D. listening