It was on May 12, 2008 ______ the Wenchuan Earthquake happened.
| A．when | B．which | C．since | D．that |
The book was written in 1946, ____the education system has witnessed great changes .
| A．when | B．during which | C．since then | D．since when |
---- It is demanded that the letter ___by the end of this week , dad !
----I’ll do it immediately .
| A．should mail | B．was mailed | C．mailed | D．be mailed |
Please remain ______; the winner of the prize will be announced soon.
| A．seating | B．seated | C．to seat | D．to be seated |
You ___ go there to meet him if you want to, but you____! He’ll come here soon.
| A．may； mustn’t | B．have to； needn’t |
| C．can； needn’t | D．can； mustn’t |
—I’m sorry I broke your mirror.
—Oh, really? ______.
| A．It’s OK with me | B．It doesn’t matter |
| C．Don’t be sorry | D．I don’t care |