The war made ______ impossible for the scientist to go on with his research.
A．him B．it C．this D．that
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
