-Are you guys ready for the Campus Singers Competition?
-Sure! Since we are young, try it，__________ we will regret！
| A．and |
| B．but |
| C．or |
| D．then |
New iPhone goes on sale on Friday with ________ bigger screen and 4G wireless technology, as ________ company seeks to keep its competitiveness.
| A．a ; a | B．a ; the | C．the ; the | D．the ; a |
Much as he ________ he has a good command of English, he sometimes feels it hard to find an appropriate version for some Chinese idioms.
| A．complains | B．declares | C．confirms | D．claims |
Could it be in the restaurant in ________ you had dinner with me yesterday ________ you left behind your keys and wallet?
| A．which; which | B．which; that | C．that; where | D．where; that |
Every possible means _____ to prevent the air pollution, but the sky is still not clear.
| A．is used | B．are used | C．has been used | D．have been used |
____ the PX project will be called off depends, for it still needs more research and discussion.
| A．That | B．Whether | C．Where | D．What |