What seems to be a simple idea always turns out _____ that is hard to put into practice．
A．the one B．one C．ones D．another
We regret _____ you that．because of the necessary repair, our library will be closed next month．
A．to inform B．informing C．to inform of D．of informing
To my great joy．I got a chance to take a photo with Andy after the vocal concert, which I _____forward to for years．
A．have been looking B．had been looking
C．looked D．had looked
Li Ming, don't forget to turn off the lights before you leave the office, _____?
A．won't you B．should he C．shall we D．will you
_____ is well known to the world is that China has very top technology in space industry．
A．It B．As C．What D．Which
With two children _____ high school, the farmer couple have to work from morning till night．
A．attended B．being attended C．attend D．attending
