[解析]
W:Hey,where is everybody?
M:They took ben to the park.Where have you been?
W:Sorry,I'm late.I picked up the cake and it took me longer than I expected.When will the party start?
M:Ben invited eight children from school and they'll arrive at about two in the afternoon.
W:Okay. Then I'll put the candles on the cake and leave it in the kitchen.And then I'll come and help set the table.