______, the conference began.
| A．The candidates having taken their seats |
| B．The candidates had taken their seats |
| C．Taken their seats |
| D．Taking their seats |
He often takes this road to avoid ______ the troublesome boy.
| A．to meet | B．meeting | C．to meeting | D．to have met |
As is known to most of us, Maodun was born in _______is now called Wuzhen.
| A．what | B．that | C．which | D．where |
Please speak in a _______ , or the teacher will hear what you say.
| A．voice | B．whisper | C．science | D．sound |
--Excuse me, I don't think you can smoke here.
---Really sorry. I ______ this is a non-smoking room.
| A．didn't know | B．don't know | C．have no idea | D．haven't known |
The class ______ big. Now the class_______ practicing swimming.
| A．are ;are | B．is ;is | C．is ; are | D．are ; is |