【C7】A．teachersB．classmatesC．partnersD．students

【C7】A．atB．toC．forD．over

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

【C7】A．adviceB．adviseC．advocateD．advance

【C7】A．concernsB．concernC．concerningD．concerned

Which group of people make some efforts to help pupils in elementary schools？A．TeachersB．R

【C15】A．TeachersB．DoctorsC．ResearchersD．Workers