（2013·安徽卷)I to my cousin’s birthday party last night, but I was not available
| A．went | B．had gone |
| C．would go | D．would have gone |
_____ computers are convenient to us in daily life, it may also cause other problems.
| A．Whether | B．Because | C．As | D．While |
Mistakes 
don’t just happen; they occur for a reason. Find out the reason, and then making the mistake becomes_______.
| A．favourable | B．precious | C．fundamental | D．worthwhile |
The plan just because people were unwilling to cooperate.
| A．broke down | B．pulled down | C．turned down | D．put down |
With the decision ______, the members present at the meeting were dismissed(解散).
| A．to make | B．to be made | C．made | D．having made |
All over the world the mobile phone has become _____ people would now call a necessity.
| A．which | B．that | C．what | D．when |