通读下列对话，然后根据上下文补全对话内容。

（ A：David B：Mary ）

A：Hi，Mary. Have you heard of the volunteer activity this week in our school？

B： （1）　   　.

A：Ah，don't you know？It is "Empty Plates Movement". And I'm one of the volunteers.

B： （2）　   　？

A：We will put up signs about saving food in our school dining hall at first.

B：Oh，sounds interesting!What else will you do？

A： （3）　   　. We have lots of things to do.

B：Wonderful!When will it start？

A：At 3：00 tomorrow afternoon. （4）　   　？

B：Yes，I'd love to. See you tomorrow.

A： （5）　   　.