15.??Scientists are now making plans to ___ Mars so that it will become possible for humans to live there. A. transfer B. form C. reform D. transform ...

10.??Chemicals are released into the air. As a result, the atmosphere becomes thicker and ___ more of the Sun's heat. A. retains B. restrains C. remains D. regains ...

5.??In many ways, Mars is the planet which is most ___ Earth. A. familiar with B. familiar to C. similar to D. similar with ...

25.??Nowadays many women have done some horrendous things ___ make themselves more beautiful. A. so as to B. as well as C. so D. as ...

20.??In Africa, there were tribes which ___ stretching the ear lobes. A. went in for B. went for C. went D. went to ...

15.??These are all ___ in which people have been forced by society to endure much physical pain and suffering… A. examples B. instances C. cases D. environment ...

10.??Although people were ___ to Sade, she enjoyed it. A. different B. indifferent C. indifference D. undifferent ...

5.??Sade herself is not clear ___ why her UK fans stopped buying her albums. A. as B. as of C. as to D. to ...

25.??The players would use ___ force was necessary to get the ball. A. anyway B. whenever C. all D. whatever ...

20.??The Roman Empire has long ___ vanished. A. from B. before C. until D. since ...