1.My mother has been a nurse   (for,since)about one year.

2.I've worked in this company for quite  (a few, a little)years.

3.A key ring is used for   (hold, holding)keys.

4.Mr Hu is our headmaster.He is  (in charge of, take charge of)our school.

5. A policeman helps keep our city   (safe, safely).

6. An architect  (draws, writes)plans of buildings.