The place _____ the bridge is supposed to be built should be _____ the cross-river traffic is heaviest.
| A．which; where | B．at which; which |
| C．at which; where | D．which; in which |
—Excuse me, Madam．Taking photos is forbidden here out of security．
—I’m really sorry, I _______ of that．
| A．am not informed | B．hasn’t been informed |
| C．hadn’t been informed | D．wasn’t informed |
The civil war broke out in Libya, ______ to the instability of the international oil price．
| A．to contribute | B．contributed |
| C．having contributed | D．contributing |
Recently a new social issue has been brought to everyone’s attention _____food additives are abused．
| A．when | B．whether | C．that | D．which |
While the police have already done a lot of investigation, much evidence _____.
| A．is remaining to be confirmed | B．remained to be confirmed |
| C．is remained to be confirmed | D．remains to be confirmed |
_____ on everyday practice, progress in English is a goal which can be achieved．
| A．Based | B．Basing | C．Having based | D．Being based |