3. Mary dropped in ____ Mr Smith, but he　 wasn' t at home, so she went to drop in ____ Mr Smith's office.　　　　　　　 A. on, on　　　　 B. at, at　　　　　 C. on. at　　　　　 D. at. on

2. The worker can make chairs ____ wood, and also can make paper ____ wood.

A. from, of　　　 B. of, from　　　 C. of. of　　　　　 D. from, from

1. The teacher is writing ____ a piece of chalk on the blackboard while the students are writing ____ink in exercise books.　　　　 A. with, in　　　 　　 B. in, with　　　　 C. in, in　　　　 D. with, with

16、in, into：into表示动向，不表示目的地或位置。如：We walked into the park.；in通常表示位置。如：We walked in the park；in和drop, fall, put, throw, break等终止性动词连用时，也可以表示动向。如：I have put the coin in (into) my pocket.我把硬币放进衣袋。

练习(一)、介　 词

15、in front of 和in the front of：in front of = before，是“在……前面”的意思(不在某物内)； in the front of则是“在……前部”的意思(在某物内)。如：There is a desk in front of the blackboard./ The boy sat in the front of the car.。

14、as, like：as作“作为”、“以……地位或身份”解。如：Let me speak to you as a father.(事实是父亲)；like作“象……一样”解。如：Let me speak to you like a father.(事实上不是父亲)。

13、in charge of和in the charge of：两者都表示“由谁负责、照顾、管理”。区别在于：in charge of后接被照管的人或物，而in the charge of后面则跟照管的人。如：Who is in charge of the project?/ The project is in the charge of an engineer.。

12、表示“用”的in和with：表示工具的“用”，用with，而表示材料、方式、方法、度量、单位、语言、声音等的“用”，用in。如：He is writing a letter with a pen./ He wrote the letter in pencil./ We measured it in pounds./ Read the text in a loud voice./ Tell me the story in English.

11、besides, except, but, except for：besides指“除了……还有，再加上”。如：All went out besides me.；except指“除了，减去什么”，不能放在句首。如：All went out except me.；but 与except意思近似，表示“除了……外”经常用在no, all, nobody, anywhere, everything等和其他疑问词后面。如：I never saw him reading anything but the newspaper.；except for表示“如无……就，只是”表明理由细节。如：His diary is good except for a few spelling mistakes.。

10、between, among：一般说来，between表示两者之间，among用于三者或三者以上的中间。如：You are to sit between your father and me./ He is always happy among his classmates.

注意：但有时说的虽然是三个以上的人或东西，如果强调的是两两相互间接关系，适用于between。如：Agreements were made between the different countries. 在谈到一些事物或一组事物，而把它们视为分居两边时用between。如：The little valley lies between high mountains.。在谈事物间的差别时，总是用between。如：They don’t know the difference between wheat, oats and barley.