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Hi Maz and Bobby, I don't know what you're up to this Sunday, but if you're at a loose end, come over to my place. We're going to have a barbecue. Tom Hi Tom, Thanks mate, but I'm completely snowed under at the moment. I have to write an essay by Monday afternoon, so I'll be working all weekend. I've got nothing arranged for the following weekend though, so maybe we can meet then? I'll call you later. Bobby Dear Tom, Like Bobby, I'm a bit tied up tomorrow. Unfortunately, I have to go to my great uncle's house for a family lunch. He was ill so we thought it might not happen, but it looks as i冬至日时，下列各地白昼最长的城市是：A.上海B.堪培拉C.北京D.莫斯科