A．speakB．observeC．sayD．remark

A．discussB．talkC．sayD．inform

A．changeB．observeC．improveD．meet

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

【C6】A．knowB．judgeC．sayD．determine

【C17】A．speakB．sayC．readD．produce

【C5】A．knowB．speakC．sayD．talk