Mary was much kinder to Jack than she was to the others, ____, of course, made all the others upset.
He often takes this road to avoid ______ the troublesome boy.
As is known to most of us, Maodun was born in _______is now called Wuzhen.
Please speak in a _______ , or the teacher will hear what you say.
--Excuse me, I don't think you can smoke here. ---Really sorry. I ______ this is a non-smoking room.
The class ______ big. Now the class_______ practicing swimming.