It was at midnight ______ he got to his friend’s house．
A．when B．since C．that D．while
The global warming is more and more serious, for which human beings ______．
A．are blaming B．are to blame
C．are going to blame D．are to be blamed
--- Grace won’t like it, you know．
---______ ? I don’t care what Grace thinks．
A．So where B．So what C．So why D．So how
It is said in the book that Tomas Edison （1847-1931） _______ the world leading inventor for thirty years．
A．would be B．has been
C．was D．had been
The old couple preferred a flat in a small town to ______ in so large a city as Chongqing．
A．this B．it C．that D．one
In the face of ______ failure, it is the most important to keep up _____ good state of mind．
A．/ ; a B．a; / C．the; / D．/; the
