_______, a learned man makes fewer mistakes in life than a man without knowledge.
| A．In general | B．As general |
| C．On general | D．At general |
If you work hard, you will _____ a good teacher.
| A．have | B．make | C．follow | D．learn |
--- Who broke the window? --- I _____.
| A．had | B．broke | C．was | D．did |
—Turn off the TV, Jack. ____your homework now?
—Mum, just ten more minutes, please.
| A．Should you be doing | B．Shouldn't you be doing |
| C．Couldn't you be doing | D．Will you be doing |
—What do you think we can do for our aged parents?
—You ________ do anything except to be with them and be yourself.
| A．don’t have to | B．oughtn’t to | C．mustn’t | D．can’t |
His lack of professional knowledge _______for the failure of the experiment.
| A．accounted | B．explained | C．counted | D．contributed |