It was shameful to be found sleeping in class. His classmates’ laughter only_____ his embarrassment.

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。

When I was in the 8^th grade in Ohio, a girl named Helen in my class had a terrible accident. As she was  31   to the bus in order not to miss it, she slipped on the ice and fell under the back wheels of the bus. She 32  the accident but was paralyzed from the waist down. I went to see her, in my 13-year-old 33  thinking that she wouldn’t live 34  from then on.

Over the years, I  35  and didn’t think much about Helen after that. Three years ago ,in Florida, my oldest son was hit by a car while riding his bike, 36  a terrible brain injury. While I was looking after my son, a lady who said she was the hospital’s social worker called. It was a(an)  37  trying(难受的)day. I burst into tears for no reason and rang 38  .

A short time later, a beautiful woman, in a wheelchair, 39  into my son’s room with a box of  40  .After 16 years, I still 41  Helen. She smiled, handed me the tissues and hugged me. I told her who I was, and after we both went through the shock of that, she began to tell me about 42  since we last saw each other. She married, had children and got her degree so that she  43 the path for those people who were less 44 than her. She told me that if there was anything she could give me, it would be  45 .

Looking at this wonderful, giving person, I felt  46  .But I also felt the first hope I had since learning that my son was  47  .From this person that I thought would have no  48 of life, I learned that where there is life, there is hope. My son miraculously(神奇的)  49 and we moved north, but I owe Helen 50  that I can never repay.

From facts, scientists have_______ that more energy is being absorbed from the sun, throwing the earth’s energy “out of balance”.

In their efforts to persuade us to buy that product, shopkeepers have made a close study of human nature and have_______ all our little weaknesses.

I want to ________ the secrets of nature and apply them for the happiness of man.

News reports say peace talks between the two counties have________ with no agreement reached.

Sometimes we need both cultural________ and government action—a change in values and a change in policy—to promote the kind of society we want.

A person of high ideals is highly respected. What people value is not based on outside ________.

My father is a _______ motorist—he never does any dangerous driving.

_______ supplying news from all over the world, newspapers give us a lot of other useful information.