Word Form. 将括号中的各词变为适当的形式填入空白。
56、His wife would rather they _____________ (not, talk) about the matter any more.
57、The earth is one of the nine planets which _____________ (revolve) round the sun.
58、The presidential candidates in the U. S. _____________ (concern) with winning the states which have the largest population.
59、Only by keeping down costs will America maintain its _____________ (compete) advantage over other countries.
60、The robots used in nuclear plants to handle the radioactive materials prevent human personnel from ___________ (expose) to radiation.
61、He has decided to have a look at the house and see if it might be worth _____________ (buy).
62、It is self-esteem that makes it possible _____________ (cope) with the everyday problems of growing up.
63、Experts found in an experiment that improved self-control and enhanced creative thinking ability ___________ (result) from daydreaming.
64、The nearer a society _____________ (approximate) to zero population growth, the older its population is likely to be.
65、A number of difficulties _____________ (arise) since we began to work on the new design.