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21．Thesalesmansaidthatthiefwasayoungmanwith_______brownhair.A．the,aB．the,不填C．a,不填D．a,a22．—Whoshouldbesentthere,AliceorMary?—.Morepeoplethanneededhavearrivedthere.A．NeitherB．NoneC．EitherD．Both23．Althoughhewasdisabled,hetriedtoleadaspossible.A．asnormalalifeB．sonormalalifeC．asanormallifeD．soanormallife24．Naturalmaterialswillbreakdownaperiodoftime.A．forB．throughC．overD．on25．—Whatdoyouthinkofmycomposition?—Itwellexceptforsomespellingmistakes.A．readB．readsC．isreadD．isreading26．—Look!Thecloudsaregathering.—Yes,I’mafraiditbepouringdownsoon.A．needB．mustC．shouldD．might27.．—Haveyoucompletedyourpaper?—Notyet.Ithelastchapter.A．wroteB．amwritingC．willwriteD．havewritten28．ourearth,oritwillbenolongerfitforustoliveon.A．ProtectB．ToprotectC．ProtectingD．Protected29．E–shopping,whenproperly,cansavealotoftimeandenergy.A．doB．doingC．doneD．todo30．—Itremainstobeseentheplancanbeputintopractice.—Itdependsonyourdetermination.A．thatB．howC．whereD．whether31．fromothercontinentsformillionsofyears,Australiahasmanyspecialanimalsandplants.A．BeingseparatedB．HavingseparatedC．TobeseparatedD．Havingbeenseparated32.—Whydidn’tyouattendthemeetingthismorning?—ButIanythingaboutthat.A．didn’ttellB．haven’ttoldC．hadn’tbeentoldD．haven’tbeentold33.Thesupermarkethassolittleparkingspace,isreallyaproblem.A．whichB．whatC．itD．as34．Thethiefwhogotcaughtmoneywastakentothepolicestation.A．stealB．tostealC．stealingD．stolen35．Undergreattreatment,Manyisbeginningtoandwillsoonrecover.A．pickupB．sendupC．growupD．putup