Students should by all means______ their studies though there are a lot of entertainments inviting them.

   A. devote to   B. fix on    C. concentrate on   D. pay their attention

―I still can’t operate the machine, sir.

 ―Well, You’d better ____the way I did it.

  A. keep on mind  B. keep in mind   D. fix on mind  D. fix in mind

I watched everyone hurrying to and fro, most with eyes ____ the ground.

After the examination, the doctor told my parents my sight would get worse and that I would lose my sight finally. On the way home from hospital, no one said a word. One day, would I only imagine the scenery beyond the glass rather than see it?
That September, I entered middle school. Most nights I had homework that included an armful of books to read. To keep up with other children, I took great trouble to finish the task. With my nose a couple of inches from the page, I was tired easily. What’s worse, after I had read several pages on my own, the words slipped off the page into inky pools.
However, then I did not have audio books and electronic devices like kids do now. Instead, Mom volunteered to read out loud. Mom worked part-time, cleaned the house, cooked and spent time with Grandma. In spite of being so busy, she showed up in my room like clockwork. She put on her reading glasses. Mom always thought those glasses made her look old. To me, she looked like a teacher.
In my room, Mom’s voice competed with the ticking of the clock. Being forced to focus on listening, I found a way to keep my marks up and compete with the other kids. When the teacher asked a question, I raised my hand with confidence. Teachers praised me for having a good memory. Reading removed my fear for my failing sight, reading also made me curious about other people’s challenges and how they managed. Though I could not use my eyes to fix on each passage, my mind lit up with every new book.
True to what the doctor said, the worst came, but thanks to Mom, my sense of hearing now allows me to “see”. This was the most precious (珍贵的) gift from a mother to her child.
【小题1】Why did the author and his parents keep silent on their way back home from hospital?

It is very important to have healthy teeth. Good teeth help us to chew our food .They also help us to look nice.

How does a tooth go bad? The __51 begins in a little crack in the  enamel(珐琅) covering of the tooth. This happens after germs and bits of food have__52  there. Then the decay slowly spreads inside the tooth. In the end, poison goes into the blood, and we may feel quite ill.

How can we keep our teeth__53  ? First, we ought to visit our dentist twice a year. He can fill the small holes in our teeth before they destroy the teeth. He can__53  __54  our teeth to check that they are growing in the right way. __55  , many people wait until they have toothache before they see a dentist. Secondly, we should brush our teeth with a toothbrush and fluoride(氟化物) toothpaste at least__56  a day—once after breakfast and once before we go to bed. We can also use wooden toothpicks to__57 between our teeth after a meal. Thirdly, we should eat food that is__58  to our teeth and our body: milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables and fresh fruit. Chocolate, sweets, biscuits and cakes are bad, especially__59  we eat them between meals. They are harmful because they__60  our teeth and cause decay.

51.  A. destruction     B. decay         C. fault        D. hurt 

52.  A. stored          B. collected     C. laid         D. piled 

53.  A. healthy         B. complete      C. effective    D. painless 

54.  A. observe         B. skim          C. watch        D. examine

55.  A. Unexpectedly    B. Certainly small    C.Unfortunately   D. Generally

56.  A. once            B. twice         C. three times  D. four times 

57.  A. drill           B. dig           C. clean        D. explore

58.  A. delicious       B. valuable      C. beneficial   D. meaningful

59.  A. what            B. how          C. whether       D. when 

60.  A. stick to        B. attach to    C. fix on        D. keep to