A：Hello!
B：Hello!This is Joan． （76） ______
A：Hi，Joan!This is Maria．What's up？
B：I want to go shopping this afternoon． （77） ______
A：Oh，I'd love to． （78） ______ What do you want to buy？
B：My schoolbag is too old．I need a new one．
A：All right．When do you want to go？
B：（79） ______
A：It's OK for me，I am free this afternoon．
B：（80） ______
A：See you!

A．I need some sports shoes． B．See you then． C．Who's this？ D．How about 4 o'clock in the afternoon？ E．Would you like to go with me？