The driver turned his car sharply to the left to give the way to the running bull only _________ a tree by the road.                                                   

    A. to knock into   B. knocking down    C. to knock at         D. knocked over

      good manners to say “Sorry” when you knock into someone but    no need to say it again and again .

 The simplest way to say it is this: I believe in my mother. My  36 began when I was just a kid. I   37  becoming a doctor.

My mother was a domestic. Through her work, she observed that  38 people spent a lot more time reading than they  39   watching television. She announced that my brother and I  40 watch two to three pre-selected TV programs during the week. With our free time, we had to read two books each from the Detroit Public Library and 41 her written book reports. She would mark them up with check marks and highlights. Years later, we realized her marks were a  42 . My mother was Illiterate(不识字的，文盲的)。

When I entered high school I was a(n) 43  , but not for long. I wanted the fancy clothes.  I wanted to  44 the guys. I went from being an A-student to a B-student to a C-student. One night my mother came home from  45  her various jobs and I complained about not having enough Italian knit shirts. She said, “Okay, I’ll give you all the money I make this week scrubbing floors and cleaning bathrooms, and you can buy  46 food and pay the bills. With everything  47 , you can have all the Italian knit shirts you want.” I was very  48  with that arrangement but once I got through distributing money, there was  49 left. I realized my mother was a financial genius to be able to  50 our heads and any kind of food on the table, 51  buy clothes. I also realized that immediate satisfaction wasn’t going to get me anywhere. Success required intellectual preparation. I went back to my  52 and became an A-student again, and eventually I  53 my dream and I became a doctor.

My story is really my mother’s story—a woman with  54  formal education or property who used her position as a parent to change the lives of many people around the globe. There is no job  55 than parenting.（养育） This I believe.

The best way to deal with these bad habits is not to _______ the habit in the first place.

A. get into         B. come into            C. knock into               D. run into

         Scientists are confident that they can make lasers which can ____ missiles.

A. knock down B. knock out                  C. knock into                 D. knock off