1.(care, careful, carefully, careless, carelessly, carelessness)

1)Be______________  not to break the window.

2) She______________the old lady as ii she were her mother.

3) All the babies are taken good______________of in this nursery.

4)If the driver drove more______________，he wouldn't have so many accidents.

5) A______________ driver is a danger to us all.

6) His mother always criticizes him, because he shows great______________in everything he

does.

7)I hope you will be more______________about your lessons in future.

8) 1 must say that he did the work very______________.

2. (difference, different, differential，differently)

1) You look______________with your hair cut.

2) There are several  ______________  between cricket and football.

3) They thought______________and felt______________

4)We have a______________salary structure based on employees' experience.

3. (economic, economics, economy, economical, economically)

1)The past twenty-year______________in China was growing rapidly.

2) He newly bought an______________and practical house.

3) We need a rational______________system.

4) He is______________ independent.

5)The region suffered______________as a result of the social turmoil.

6)Of all the subjects, he likes______________very much.

4. (late, lately)

1)You should not stay up so______________.

2) 1 haven't seen her______________.

5. (wide, widely)

1) His eyes were______________with surprise.

2) He was______________ known.

6. (clear, clarify, clearly)

1)You should try to______________up her doubts.

2) Can you______________your point a little further?

3)he little baby cannot______________pronounce this word.

7.(add, addition, additional, additionally)

1) In______________to English，he can also speak German.

2) Mother needs______________help in the kitchen on weekends when all of us come from  school.

3) The fire is going out;will you______________some wood?

4) This is an ______________ proof of his ignorance.

5)，he was taught how to drive.

8. (use .useful, useless, used)

1)Prof. Wang tells us to make good______________of our time in class.

2) The spring of my watch is broken; it is completely______________now.

3) May I______________your bicycle tomorrow morning?

4) This is a very______________dictionary for the beginners of English.

5) It is much cheaper to buy a______________car than a new one.

6) It is no ______________ crying here.

7) You will soon become ______________ to it.

8) That old machine is out of.

9) It ______________  to be said that.