[答案]C. reaction.

　　[注释]reaction(to)对......的反应：Our reaction to a joke is to laugh.

　　[答案]D. respectful.

　　[注释]respectable(=deserving respect)值得尊敬的,品行端正的。respectful(=showing respect to)有礼貌的，表示尊敬的。Respective各个的。respected 尊敬的。Respecting prep.(=relating to; concerned with)关于，说到。

　　[答案]B. smooth over.

　　[注释]smooth over(=make smooth, put right, balliate)使平息，使恢复正常的，掩饰：1)I will try to smooth their quarrel over.(我将设法平息他们的争吵。) 2)Don't try to smooth over your fault.(不要设法掩饰你的过错。)

　　[答案]C. to.

　　[注释]entitle sb. to sth.(=give a right to)给予权利： 1)He is entitled to special treatment because of his rank(由于他的级别他有权享受特殊待遇。) 2) Officers are entitled to travel first class.(军官们有权乘头等车旅行。)

　　[答案]B. taken to.

　　[注释]take to 养成(某种习惯)。A stroke of 一件。本题译文：他以成了酒徒，从来没有干过一件工作。