--You used to be quiet, ____you?--Yes, and I used to be very shy.
I took the wrong train ______.I didn't even know it until half an hour later.
This kind of pot is ______ keeping tea hot.
询问天气情况该怎么问?_______________.
上午遇到老师和同学时,应说:______________________.
你的同学对你说了声:“How are you?” 你应该怎样回应他/她?