[解析]
AB
Text 6
W:Make sure to remember that we are invited to Emma's birthday celebration tonight!
M:Yes,I will not forget.At what time should we set out?
W:Exactly at 7 pm.We'd better leave by 6 pm to avoid the traffic jam.
M:Is it a costume party?
W:No,it's a relaxed event.You can wear your favorite sweatshirt.
M:Great.I have to rush.I will try my best to come back early.
W:That sounds good.See you soon!