It was not until the end of last year _____ the economy in our country began to develop rapidly.
A．when B．that C．which D．in which
---Anna, you look so tired and wet all over!
---Well, you know, all morning I _______ my books to my new office on the third floor.
A．am moving B．have moved C．had moved D．have been moving
---It was dangerous to throw that bottle out of the window. You could have hurt someone.
---I’m so sorry! I _______ .
A．am not thinking B．wasn’t thinking C．haven’t thought D．don’t think
Tsinghua University, ______ in 1911, is home to a great number of outstanding figures.
A．found B．founding C．founded D．to be founded
---May I take this book out of the reading room?
---No, you______. You read it in here.
A．mightn’t B．won’t C．needn’t D．mustn’t
---We could invite John and Barbara to the Friday night party.
---Yes, _______? I’ll give them a call right now.
A．why not B．what for C．why D．what
