从方框中选择适当的选项补全对话，有两项多余。
A：Parks are really important in a neighborhood. ____
B：Sounds good.What can we do?
A：Well, we can pick up garbage(垃圾)．
B：What a great idea! ____
A：Yes, let's ask them to come.We can ask the neighbors, too.
B：____
A：We should bring garbage bags and buckets(水桶)．
B：____
A：Let's volunteer on Saturday.The weather will be sunny.
B：____
A：Wear old clothes.We'll probably get dirty.
B：OK.I will tell the others.
A．People must keep them clean.
B．When should we volunteer?
C．What should we wear?
D．Maybe we can invite our friends to help.
E．Let's volunteer to clean up Central Park.
F．I learned a lot from the activity.
G．What should we bring?
2H2O + O2↑