选择合适的句子，补全对话

A. How can we get there?         B. Good idea. C. We must stop and wait.         D. Thank you.

Amy: Sarah, let's go to the science museum after school.

Sarah:

Amy: We can go by bike. Look at my new helmet.

Sarah: Wow, it's beautiful!

Amy: Let's go.

Sarah: It's a red light now.

Amy: Oh, right! I must pay attention to the traffic lights!