【C6】A．knowB．judgeC．sayD．determine

A．discussB．talkC．sayD．inform

A．speakB．observeC．sayD．remark

【C9】A．by sayingB．for sayingC．to sayD．saying

【C5】A．knowB．speakC．sayD．talk

【C8】A．makeB．judgeC．concludeD．prove

【C10】A．knowB．speakC．sayD．talk