．The conference aims to develop business and let people think about ______ they can have a positive influence on the planet．
| A．why | B．that | C．what | D．how |
You __________ the day off from work, which created a burden for everyone else.
| A．shouldn't have taken |
| B．mustn't have taken |
| C．couldn't have taken |
| D．wouldn't have taken |
We __________ the difficulty together, but why didn't you tell me?
| A．should face |
| B．might face |
| C．could have faced |
| D．must have faced |
"If you __________ to my party yesterday, you __________ the reason why I am wearing these clothes now. "Helen said to me.
| A．came; had known |
| B．had come; would know |
| C．had come; would have known |
| D．came; would know |
But for the fact that China __________ also affected by the global economic crisis, we __________ fewer unemployed workers now.
| A．is; would have |
| B．were; would have |
| C．was; would have had |
| D．were; would have had |
-She looks very happy. She __________ have passed the exam.
-I guess so. It's not difficult after all.
| A．should |
| B．must |
| C．could |
| D．might |