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

【C7】A．takenB．drivenC．accompaniedD．delivered

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

【C19】A．aquireB．retrieveC．supplyD．deliver

【C4】A．letB．provideC．supplyD．grant

A．ensureB．separateC．spreadD．switch

【C9】A．letB．provideC．supplyD．grant