[解析]
M:Mary,tomorrow is your mom's 50th birthday,do you remember?
W:Of course I do.How shall we celebrate it?
M:First of all,a birthday present.What about buying her a beautiful skirt?
W:That's a good idea.It'll make her look younger.And a birthday cake too.
M:We can have it at home.I've learned to cook a few dishes from a Chinese friend.I'm sure she will like them.
BB