4、erewasplentyalready.4.汤姆一定已经吃了蛋糕了,因为他的嘴上有些蛋糕。Tommust_have_eatenthecake,forthereissomeonhismouth.5.如果你跟着他学,你本可以向他学到更多东西的。Youmight_have_learnedmorefromhim,ifyouhadfollowedhim.Ⅲ.单项填空1.Althoughthis________soundlikeasimpletask,greatcareisneeded.A.must B