Ⅲ. 补全对话。
根据下面的对话情景,在每个空白处填上一个适当的句子,使对话的意思连贯、完整。
A: Hello, Tom! How are you?
B: Fine, thanks. What about you?
A: 1. ______ Recently the air is not fresh.
B: I'm sorry to hear that. Look! There are too many cars and trucks on the road. Their waste gas creates air pollution. 2. ______
A: The environment is very important to us. 3. ______
B: Right. What should we do?
A: First, we'd better not drive a car to school. It's not good for our health and the environment.
B: I agree with you. 4. ______
A: Second, we ought not to buy clothes made of animal fur.
B: Yes. 5. ______
A: We should do everything we can to protect the environment.
B: I agree. Let's do it together!