从方框中选择合适的选项补全对话。
Lily:
1．Mom:
2．Lily: OK. Let's cross the street.
Mom:
3． Look at the traffic lights. It's red. Don't cross the street.
Lily: Oh.
4． Let's stop and wait.
Mom: The light is green.
5．Lily: Let's go.
| A．Be careful! |
| B．Let's go to the bookstore. |
| C．I'm sorry. |
| D．We can go now. |
| E．I'm going to buy a new book, Mom. |
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