[解析]
W:Harry,guess what?I've just received an email from Pamela.She and Peter are coming down to see us this weekend.
M:Oh,that's good news!We haven't seen them for ages.
W:Yeah.The last time we met them was at our wedding three years ago.
M: Did Pamela mention how long they'll stay?
W:About one week.
M:Great!I can't wait to show them around our new house.
W:Me too. We haven't had any guests since we moved in here.If the weather is fine,we can have a barbecue in the garden.
M:Good idea.I'll go to the market tomorrow to buy all the things we'll need.