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