With his attention________on the shops along the roadside，he knocked an old man down while riding to school.

A  concentrating     B．concentrated     C．to concentrate      D．concentrates

答案　B

解析　考查词组，故选B项。

　　阅读下面短文，掌握其大意，然后从11-30各题所给四个选(A、B、C和D)中选出最佳选项.

　　Johny Conman was lazy. He had finished his education and was happy to sit in his room and 1 to the radio all day long 2 , he had been doing nothing for almost six months, which worried his father very much. One day Conman 3 that he had to do something.

　　“Johny, when I was your age, I was working and 4 my ten brothers and sisters. I want you to go out and get a 5 .”So than is what he did. In fact, in the next three months, John started ten jobs and was 6 from ten jobs, He explained to his father.

　　“They wanted me to work at 8 a.m. and told me to do all sorts of 7 things. A tiresome day to day job is not for me.”

　　Mr Conman decided to put his foot down.

　　“I don't 8 how you do it,” he said. “Either you earn some money or move out of the house. I give you one week.”

　　In the next 9 days Johny began to change. He still stayed in his room10 , but spent his time writing letters or reading through the newspapers. More and more post began to arrive for him. He 11 a new suit for himself and invited his parents to the theatre and 12 afterwards at the most expensive restaurant in town. When his 13 parents arrived home after their evening hour, a policeman was waiting at the front door.

　　“Johny Conman,”he said as he 14 him a piece of paper. “I'll see you in the court tomorrow.”

　　When they got inside, Johny told his parents everything, “When you told me to 15 some money, I decided to put an advertisement in the newspaper, saying 'New way to make money fast! Send me $5 and I'll tell you my 16 '. When I received the money I wrote back 17 people advertise a new money-making plan in the paper and wait for the 18 to send them money.”

　　John was fined $250 by the court and ordered 19 all the people back. As he left the court-house feeling very 20 , a newspaperman came up to him, “Young man, would you like to tell your story to my newspaper for $200?”

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A. to play games

B. to have fun

C. to have dinner

D. to sleep

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9. I am in______charge of the class which was in ______ charge of my wife.

  A. 不填；the　　　　　　B. 不填；不填

　C. the; 不填　　　　　　D. the; the

选A。in charge of 的意思是“负责”、“管理”，其主语通常是人；in the charge of 的意思是“由……负责或管理”，其主语通常是物。

10. —Shall I sit at this end of the boat or the other end?

  —If you keep still, you can sit at______end.

  A. neither   B. each   C. either any