April22isWorldEarthDay．Itisadaytoremindusto（16）___ourplanet．Theearthfacesalotof（17）___．Whatarethey？Whatcanwedotohelpher？WecalltheEarthour"mother"．Iftheearthisreallyamother，shemust

　　April22isWorldEarthDay．Itisadaytoremindusto （16）___ourplanet．Theearthfacesalotof （17）___．Whatarethey？Whatcanwedotohelpher？

　　WecalltheEarthour"mother"．Iftheearthisreallyamother，shemustbevery （18）___．Shehas（19）___problemstodealwith．

　　Globalwarming （全球变暖） isaverybigproblemintheworld．It （20）___theearthhotandchangestheclimate．Italsomakesthesealevel （21）___．Ifthesealevelgoesonrising，someplacessuchastheMaldives （马尔代夫），StPetersburginRussiaandBangkokinThailand，may（22）

　　___underwaterinjustafewdozenyears．

　　Anotherseriousproblemis （23）___pollution．Wecanonlyuse3percentoftheearth'swater．

　　（24）___peoplethrowtrash （垃圾） andpourdirtywaterintoriversandthesea．Almost884millionpeopledon'thavecleanwatertodrink．（25）___，humansareusingupnaturalresources （资源）．AccordingtoareportfromBP （英国石油公司），therewillbenocoaltouseontheearthby2158andoilwilldryupby2050．

　　16．A．careaboutB．talkaboutC．thinkofD．lookfor17．A．questionsB．problemsC．difficultiesD．experience18．A．wellB．healthyC．strongD．sick19．A．fewB．afewC．alotofD．much20．A．protectsB．preventsC．makesD．takes21．A．raiseB．raisingC．riseD．rising22．A．appearB．riseC．diveD．hide23．A．waterB．airC．noiseD．rubbish24．A．AndB．SoC．OrD．Though25．A．BesideB．BesidesC．ExceptD．Without．