[解析]
BCABM:Hi,Judy.I'd like to celebrate my 18th birthday with some friends this Saturday.
W:Oh,really?That's great!Eighteenth birthday!You are a grown﹣up now.
M:Yeah,from now on,I have to take responsibility for my actions.It's really an important day in my life.
W:How do you plan to celebrate it,Mike?In a bar?
M:No,I plan to celebrate it at my home and invite some friends to come over.
W:How about a birthday party?We can buy some balloons to decorate your room and buy some drinks.
M:Sounds fantastic.And maybe we can prepare some food all by ourselves and make a salad.
W:That's a sign you've become a grown﹣up.
M:You're right.Well,I'll order a birthday cake on Saturday morning.Then,I'll go shopping in the supermarket.On that afternoon I'll decorate my room.
W:I will help you.