Much labor would have been saved if the electronic computers_____________ before.
| A．had invented | B．were invented |
| C．should have been invented | D．had been invented |
There is a saying which _______like this:, “Still waters run ______.”
| A．goes; deeply | B．comes; deep | C．goes; deep | D．comes; deeply |
Chemical processes _______in the treatment of materials for clothes _______the environment badly in some countries nowadays．
| A．involve；damaging | B．involved；damaged |
| C．involving；damage | D．involved；damage |
.In the last ten years she _____ like this; she is killing her health.
| A．has worked | B．has been working | C．worked | D．is working |
She did not take the advice that she ___ at rush hour, so she got lost.
| A．not travel | B．did not go | C．should travel | D．goes shopping |
Jasper is a great painter. He is _____ Picasso.
| A．as a great painter as | B．as great painter as |
| C．as great a painter as | D．so great a painter as |