．Life is too short to waste and too_______to give up.
| A．expensive | B．ordinary | C．fragile | D．precious |
Using _____ illegal drugs can lead to health problems, and it can be _____ stain on one’s life.
| A．不填；the | B．the; the | C．the; a | D．不填； a |
—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 |