解答高中英语语法问题（写出原因,语法点）

25.Firstimpressionsarethemostlasting.Afterall,youneverget_____secondchancetomakethefirstimpression.

A.aB.theC./D.another

28.Recentlyasurvey_______pricesofthesameproductsintwodifferentsupermarketshascausedheateddebateamongcitizens.

A.comparedB.beingcomparedC.comparesD.comparing

30.Tomwasabouttoclosethewindows______hisattentionwascaughtbyabirdinthegarden.

A.whenB.ifC.andD.till

33.Valentine’sDay,______itsequivalent,isnowcelebratedinmanycountriesaroundtheworld.

A.butB.andC.orD.yet

34.WilliamBeebe,oneofthefirstmen______thedepthsoftheseainabathy-sphere,gotinterestedinoceanographybecauseofonebook.

A.exploringB.havingexploredC.tobeexploringD.toexplore

35.advertisementsareofgreathelp,Idon'tthinkweshouldentirelyrelyonthem.

A.SinceB.WhileC.BecauseD.As

37.—Peterwasadmittedtoasecond-classcollege．

—He________atopuniversity,buthewasaddictedtoplayingcomputergames．

A．hadenteredB．wouldenterC．musthaveenteredD．couldhaveentered

ADACDBD

38.ItwasApril29,2010______PrinceWilliamandKateMiddletonwalkedintothepalacehalloftheweddingceremony.

A.thatB.whenC.onwhichD.where

40.________,Ibelieve,andyouwillfindTomisveryoutgoing.

A.HavingatalkwiththestudentB.Givenatalkwiththestudent

C.OnetalkwiththestudentD.Ifyouhaveatalkwiththestudent