【C7】A．experimentsB．requirementsC．supplementsD．installments

【C7】A．atB．toC．forD．over

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

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

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

A．experimentsB．checksC．discoveriesD．works

【C14】A．abilitiesB．requirementsC．tendenciesD．preferences