6、ze)that he had fallenbehind, Peter startedto quickenhis pace.【参考答案】1.Toguarantee2.Whoever3.wasreviewing4.accepted5.What6.that7.where8.hasbeenusing9.tofinish10.confused11.whose12.why13.What14.Learn15.haveallowed16.added17.where18.wherever19.tobepublished20.Havingrealized