阅读下面短文,用文中括号内所给动词的适当形式填空快啊急用阅读下面短文,用文中括号内所给动词的适当形式填空.Forestshelptokeepwaterfromrunningaway,sodrought（干旱）doesn'toftenhappen．Chines

　　阅读下面短文,用文中括号内所给动词的适当形式填空快啊急用

　　阅读下面短文,用文中括号内所给动词的适当形式填空.

　　Forestshelptokeepwaterfromrunningaway,sodrought（干旱）doesn'toftenhappen．Chinesepeoplehavebuilta"GreatWall"oftrees,millionsoftreesacrossthenorthernpartofthecountry．

　　TheGreatGreenWall1________（be）7,000kilometreslong,anditwillstopthewindfrom2________（blow）theearthaway．It3________already________（save）alotofland．

　　WangFengisaworkeratYulininShanxiProvince．He4________（work）ontheGreatGreenWallwithmanyotherpeople．We5________（visit）himathisworkplaceandwhenwesawhimhe6________（work）amongthetrees．Hetoldussomethingabouthiswork"Wemust7________（plant）manythousandsoftreeseveryyear,"hesaid"Youseeallthosesmalltreesoverthereonthathill?Thatwassandfiveyearsago．Nowit'sayoungforest!Inafewyears'time,we8________（cover）thosemountainswithtrees,too!"Hepointedtothehighmountainsfaraway．

　　Wasitdifficult9________（work）ontheGreatGreenWall?

　　Yes,It'shardwork．butit'sveryimportant．Theonlyproblemiswehaveto10________（grow）ourownfood．ButthankstotheGreatGreenWall,thelandproducesmorecrops．Sothemoretreesthereare,thebetterharvestwehave．"