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

— These days I can only sleep for four or five hours at night as I’m too busy with my research work..
— If you keep going on like that, you are sure to ______ sooner or later.

Most people give little thought to the pens they write with, especially since the printers in modern homes and offices mean that very  【小题1】 things are hand written. All too often, people buy a pen based only on  【小题2】, and wonder why they are not satisfied  【小题3】 they begin to use it. However, buying a pen that you’ll enjoy is not  【小题4】 if you keep the following in mind.
First of all, a pen should fit comfortably in your hand and be  【小题5】  to use. The thickness of the pen is the most important characteristic  【小题6】 comfort. Having a small hand and thick fingers, you may be comfortable with a thin pen. If you have a  【小题7】 hand and thicker fingers, you may  【小题8】 a fatter pen. The length of a pen can 【小题9】 influence comfort. A pen that is too  【小题10】 can easily feel top-heavy and unstable.
Then, the writing point of the pen should  【小题11】 the ink to flow evenly（均匀地）while the pen remains in touch with the paper.  【小题12】 will make it possible for you to create a  【小题13】 line of writing. The point should also be sensitive enough to  【小题14】 ink from running when the pen is lifted. A point that does not block the    【小题15】   may leave drops of ink,  【小题16】 you pick the pen up and put it down again.
 【小题17】, the pen should make a thick, dark line. Fine-line pens may  【小题18】 bad handwriting, but fine lines do not command  【小题19】 next to printed text, as,  【小题20】 , a signature on a printed letter. A broader line, on the other hand, gives an impression of confidence and authority（权威）.

—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  D. any

If you keep on, you will succeed ________.