Experts warn that medical waste from hospitals, if properly, may contribute to spreading diseases．
A．not handled B．not being handled
C．not to be handled D．not having been handled
—Why so early? The movie doesn't start till seven．
—I don't want to be at the traffic there．It's terrible during the rush hour．
A．have you left B．do you leave
C．would you leave D．are you leaving
If it the climate, I would stay here much longer．
A．is not for B．had not been fo
C．were not for D．would not be for
Sinking in the cheers of people, David walked off the stage, tears dropping he could stop them．
A．after B．when C．until D．before
．Days of snowstorms have left the city under thick layers of ice and some 50,000 homes without power．
A．to be trapped B．trapped
C．having trapped D．being trapped
Heavy smog blankets Beijing． ,city authorities start using its new smog warning system．
A．In turn B．In time
C． In response D． In return
