阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
I have a friend who had a stammer (口吃) in his childhood, but he dreamed of becoming a missionary(传教士). When he told his own desire to his friends and relatives, some of them laughed at him, and some even held down his enthusiasm       .
"I must change it." said the boy angrily, “I believe I can speak very     , I will do!"
When it was possible, he would spend an hour      to chickens. He viewed the chickens as living persons,      himself to be the person in the speech.
"In the beginning, the chickens looked so         , then they watched me curiously, putting down the food in the mouths and listening to my words. It seemed as if they had been         by my powerful and effective language. Sometimes they seemed to be listening to me        . Gradually, the effect of this practice became more and more    and I had a better understanding of the exact       of my stammer, so I found the ability to speak more."
"You may not know that my father was always tyrannical(专横的). He         believed in the old saying: 'Young man should be more knowledgeable, but should not       much.' During the whole childhood,    I spoke or commented, he criticized me seriously, which     my shy personality. I used to worry about being   at, so I became a stammerer. From then on, I kept      in front of everyone because they didn't want to see my embarrassment. But later I found myself talking in front of chickens, stammers disappeared       , therefore I regained my    ."
Now, the previous boy is the best at speaking and one of the most    missionaries. You can hardly imagine he used to have a serious language     . So when you come across disadvantages, you should believe you can      them by yourself.

A．sincerely B．impolitely C．strangely D．privately

A．frequently B．fluently C．obviously D．completely

A．contributing B．seeing C．turning D．speaking

A．imagining B．considering C．declaring D．finding

A．satisfied B．pleased C．frightened D．surprised

A．attracted B．beaten C．bothered D．influenced

A．casually B．carefully C．luckily D．cautiously

A．obvious B．slight C．crucial D．common

A．effect B．benefit C．cause D．harm

A．originally B．personally C．doubtfully D．stubbornly

A．think B．listen C．play D．talk

A．since B．before C．whenever D．unless

A．applied to B．led to C．referred to D．owed to

A．amazed B．studied C．laughed D．looked

A．silent B．active C．noisy D．upset

A．logically B．typically C．equally D．naturally

A．strength B．dream C．confidence D．freedom

A．successful B．intelligent C．modest D．responsible

A．gift B．barrier C．ability D．study

A．arrange B．exchange C．reduce D．change