Radium salts, which have been found to _____ in bones, give rise to cancers of the bone.
| A．pile up | B．build up | C．keep up | D．pull up |
The time is not far away _______ the information will be made known ______ more workers will be trained for their jobs.
| A．until; which | B．when; that | C．before; that | D．as; which |
Wit a large amount of work _______, the chief manager couldn’t spare time for a holiday.
| A．remained to be done | B．remaining to be done |
| C．remained being done | D．remaining to do |
If _______ , English teachers must pass the oral and written tests.
| A．recruited | B．were recruited |
| C．recruiting | D．to be recruited |
The WTO can’t _____ its name if it doesn’t include a country that is home to one fifth of mankind.
| A．live up to | B．go with | C．equal | D．compare with |
He may have seen the film when it was shown last week, _____ he?
| A．can’t | B．isn’t | C．didn’t | D．hasn’t |