简介:1.Thegeneralwouldntallowtheboythetreetoseewhattheen-emywasdoing.A.riskclimbingB.riskingtoclimbC.risktoclimbD.toriskclimbing2.Wewatchedthementhetreeandaswewerewalkingawaywehearditwithatremendouscrash.A.sawing;tofallB.sawing;fallC.saw;fallD.tosaw;falling3.Thestudentsareallgone.Becauseofthebadweather,theteacherpermittedthemearly.A.leaveB.tobeingleavingC.toleavingD.toleave4.Areyousurethestudentsusethenewcomputer?A.knowtoB.kn...