根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯、完整。
A: Good afternoon! How are you?
B: Fine, thank you. Oh, that's Tom speaking.
A: You're right.____
B: Sure,but she is doing her homework. Wait a moment. Lucy, it's Tom.
(After Lucy answers the phone. )
C: Hello. Tom.
A: Hello, Lucy.____
C: I have no idea. How about you?
A: I'm going fishing nearby on Saturday. Would you like to go with me?
C: ____ I'm sure we can have fun together. By the way, How can we get there?
A: ____ It's not far from here.
B: Sounds good. ____
A: Let's make it 8 :00 am at the school gate. OK?
B: OK. See you then.
A: See you.
，AC＝1，B＝
，则△ABC的面积为( )．