A．ensureB．separateC．spreadD．switch

【C7】A．ensureB．approveC．supplyD．deliver

_____________ 查看材料A.ensureB.assureC.requireD.reques

【C15】A．ensureB．assureC．reassureD．guarantee

I decided not to______John when he was in such a desperate position.A．vanishB．separateC．ab

【C17】A．ensureB．meetC．satisfyD．assure

【C2】A．contributedB．informedC．spreadD．conceived