I was really too busy with my homework and I couldn't help ____________ housework.
| A．doing | B．do | C．did | D．done |
Professor Williams keeps telling his students that the future ______to the well-educated.
| A．belongs | B．is belonged | C．is belonging | D．will be belonged |
It is______ of you to cooperate with such a bad man.
| A．clever | B．foolish | C．cruel | D．kind |
The boss ______ the worker how to do it, or the accident couldn’t have happened.
| A．can’t have told | B．ought to tell | C．could have told | D．mustn’t have told |
In the 1930s, the two countries were at ______ war, and his father was fighting at _____ front.
| A．the; 不填 | B．不填; the | C．the; the | D．不填;不填 |
Don't leave for there until__________ to do so.
| A．you'll be told | B．told | C．telling | D．you are told |