Please write a notice for the students and ______ .
| A．put it up | B．put up it | C．put it on | D．put on it |
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 |
It has been laid down that each student must _____ a composition to the teacher once a week.
| A．turn in | B．give up | C．put forward | D．bring out |
I shall take you back to Beijing _____ you are well enough to travel.
| A．presently | B．promptly | C．immediately | D．shortly |
The writer was always looking for suitable _____ to use in his next story.
| A．contents | B．articles | C．notions | D．ideas |
He gave me some very _____ advice on buying a house.
| A．precious | B．worthy | C．precise | D．valuable |