It is widely believed among bioengineers _____ it will be possible to create life under laboratory conditions．
| A．which | B．what | C．that | D．when |
I became a teacher in 1993. I _______ for 13 years by next summer.
| A．has taught | B．will teach | C．has been teaching | D．will have been teaching |
.—Have you finished your composition already, Jack?
—Yes, I ____ it within half an hour.
| A．have finished | B．finished | C．finish | D．had finished |
No conclusion _______ about whether to tear down the old buildings for a theme park until several discussions have been made．
| A．will be reached | B．is reached | C．is being reached | D．had been reached |
In recent years many football clubs ______ as business to make a profit.
| A．have run | B．have been run | C．had been run | D．will run |
Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again H1N1, so we only had time for a few words.
| A．just left | B．has just left | C．is just leaving | D．was just leaving |