tablet computers like Apple’s iPad just before bed, a research says recently, can lead to poor night’s sleep.
| A．Using |
| B．Used |
| C．To use |
| D．Use |
Sinking in the cheers of people, David walked off the stage, tears droppinghe could stop them．
| A．after | B．when | C．until | D．before |
Days of snowstorms have left the cityunder 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 |
Thanks todrama currently on air, Man From the Stars, South Korean TV dramas haveattractedwider audience．
| A．the; the | B．a；a | C．a; the | D．a; / |
—Sally, do you mind if I take off my jacket?
—Of course not．．
| A．It doesn't matter | B．Make yourself at home |
| C．Enjoy yourself | D．Forget it |