_____________[A] assist [B] track [C] sustain [D] dismiss

He was dismissed for ________ his duty.A.neglectingB.neglectedC.ignoredD.ignoring

______________[A] catching [B] ignoring [C] missing [D] tracking

在人类生活方式的自然演化中，只有达到_______阶段，才能实现自足（self－sustain)。A.氏族B.城邦C

The aim of sustainable development is________.A.t

_________(58)A.student’s B.professor’sC.assistant

It is requested that every student__________ a paper on sustainable development.A. writesB