完成对话。在对话的空格中填上适当的单词，使对话完整正确。一空一词，含缩写词。（共10小题，每小题1分；计10分）。
A：Morning, Liu Ming!
B：Morning, Wang Jun! Why are you in a hurry?
A：I have to be at school and finish my homework first before the class.
B：Haven’t you finished your homework yet?
A： . Yesterday evening my father turned
all the lights and I couldn’t finish my homework.
B：Really? Why did he do that?
A：Because we joined in an activity.
B：What was it?
A：Earth Hour. By the way, did you to take a bus to school?
B：Yeah. But I’ve to walk to school now. I want to do something for low-carbon economy(低碳经济), and
is also good for my health.
A：Sounds like a good idea! We should pay more attention to the environment.
B：Yes, you are right. walk to school together.