Nowadays teens prefer going to the cybercafé ，_____ ,as is known to us, they can chat with their friends by QQ or play games.
| A．which | B．where | C．that | D．when |
Was it near the bridge ____ the car accident took place?
| A．where | B．that | C．when | D．at which |
___in the air, this kind of steel become harder and harder.
| A．Cooling | B．Having cooled | C．Being cooled | D．Cooled |
In a chemical change, energy cannot be created ,____.
| A．nor can it be destroyed | B．not it be destroyed | C．so can’t it not be destroyed | D．either it cannot be destoryed |
The Loisels did what they could ___ the debts.
| A．to pay off | B．to pay for | C．paid off | D．paid for |
The teacher entered the classroom, _____.
| A．with book in hand | B．book in hand | C．with book in his hand | D．book in his hand |