31.Hedroveveryfastto_______thatredcar.
32.Slidesaresometimescalled________film.
33.ProfessorSmith_______themostimportantpartinhispaper.
34.Thisknifeismadeofsteel_______anditcanbeusedforalongtime.
35.Thetheoryof_______wasdevelopedbyDarwinandisnowunderstoodbynearlyeverybodyintheworld.
36.Mr.Greenhasrecentlybeen_______todirectorofthepresident’soffice.
37.Wedon’tthinkthathis_______abilityhasbeenwelldeveloped.
38.Our_______talkspromiseagoodfutureforourcooperation.
39.The_______canhelppeopletoseeverysmallobjects.
40.Physicallywefeelcomfortable.But_______,wesufferalot.