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

. He has left his book here on _____, so that you can read it.

   A. purpose    B. intention    C. aim    D. meaning

. In my opinion, you can widen the _____ of these improvements through your active participation.

   A. dimension    B. volume    C. magnitude    D. scope

 All foreign visitors are requested to _____ with the regulations in this area.

   A. agree    B. comply    C. consent    D. conform

"Who is responsible for sending out misinformation?"

"Most of the fault lies _____ the administration."

   A. in    B. to    C. on    D. with

. Professor Smith and Professor Brown will _____ in giving the class lectures.

A. exchange    B. alter    C. shift    D. alternate

I'm afraid this painting is not by Picasso. It's only a copy and so it's _____.

        A.priceless                 B.invaluable                   C.unworthy                 D. worthless

.It isn't quite _____ that he will be present at the meeting.

   A. sure                    B. right                            C. exact                    D. certain

 Can you _____ me _____ two hundred copies of this article by tomorrow.

   A. give .. out     B. send .. in

   C. write .. off    D. run .. off

. He ate what he could, and gave the _____ of the food to the birds.

A. remain    B. uneaten    C. rest    D. part