补全对话
请根据对话内容，在下面的空白处填入适当的词，使对话完整与正确。并答案填在答题卷相应的横线上。每空一词。
Mum:Now,what’s our train number?
Dad:T20 to Beijing.It’s leaving   Platform 4.
Mum:The meeting in Beijing is very important for us,but I’m  you can’t come.
Mary:Me too.but I can’t    two weeks of school.
Mum:You must look after yourself.When you are in,shut the door.And lock it when you go out.Make  you eat plenty of fresh fruit and vegetables.
Mary: Don’t worry.I’ll be fine.
Mum:Bye ,my dear.
Mary:Bye!See you in a      of weeks.