After a series of food safety incidents, the government has ______ that not enough has been done to guarantee people green and healthy food.
| A．revised | B．recalled | C．recollected | D．reflected |
—Sorry indeed, I ________ to your birthday party if …
—Forget it. I know you were out on business.
| A．must come | B．would come | C．must have come | D．would have come |
—Another cup of coffee? That’s your third since lunch.
—Yeah, well, I ____ all night preparing for my history exam. I can hardly keep my eyes open.
| A．stayed up | B．have stayed up | C．have been staying up | D．will stay up |
—What’s up? You look down. —I have piles of papers ________, but I type so slowly.
| A．to be typed | B．typed | C．to type | D．being typed |
We must apply what we have learned to our daily work because in no case _____ from practice.
| A．should theory separate | B．should theory be separated |
| C．theory should separate | D．theory should be separated |
—Why do you look so worried?
—My computer broke down and my essay ______ unfinished since.
| A．was left | B．has left | C．left | D．has been left |