18．A．so                       B．and                     C．or                       D．but

17．A．sleep                   B．1unch                   C．class                      D．play

16．A．good                   B．tall                      C．rich                     D．fat

15．A．rocking               B．reading                C．talking                 D．selling

（B）

    John is a famous writer now．But he said he was not a  l6  student when he was young．He was often late for  17  and didn't like doing his homework．Sometimes，he slept in class while the teacher was teaching．He didn't understand much，  18   he always thought he understood everything．One day the teacher  19   the students a question，“When Jack was ten years old．  20  brother Bob was twenty．Jack is fifteen now and  21  is his brother Bob?” John said. “That’s easy．Bob is twice as old as Jack，so he is now thirty．”

    Another time，the  22   in a science class asked，“When it thunders（打雷），  23  do we always see the light before we  24  the sound?”

“But, Miss．”said John quickly．“Don’t you  25  our eyes are in front of our ears?’’

14．A．in                          B．at                        C．on                       D．off

13．A．among                 B．between               C．from                   D．with

12．A．1earned about         B．talked about         C．thought about         D．worried about

11．A．what                    B．Where                 C．why                    D．how

10．A．hear                    B．return                  C．grab                             D．offer

9．A．however                B．whenever             C．whether                 D．although