---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
If you forget ______ your watch, it is likely to stop soon.
A．to wind up B．to wind off C．winding up D．winding off
Not only ______ to look after her children, but also _____ to work.
A．she had; did she have B．did she have; she had
C．she had; she had D．did she have; did she have
