【C6】A．directsB．leadsC．guidesD．conducts

[A] concentration [B] continuity [C] conformity [D] conductivity

【C10】A．directsB．guidesC．leadsD．conducts

A．didB．builtC．triedD．conducted

【C5】A．feelsB．leadsC．soundsD．appears

【38】A．concentrationB．continuityC．conformityD．conductivity

【C17】A．designedB．producedC．createdD．conducted