1. C

2. D

3. B

4. B

5. B

6. C

7. A

8. D.

1. We're reading a _______ book this week.

A. differ

B. difference

C. different

D. differently

2. She gave him a _______ look. “Are you really sure?” she demanded.

A. challenge

B. challenger

C. challenged

D. challenging

3. The article was an excellent piece of _______ journalism.

A. investigate

B. investigative

C. investigation

D. investigating

4. The company needs to reduce its _______ on just one particular product.

A. depend

B. dependence

C. dependable

D. dependent

5. You've got to try to keep _______ as you grow older.

A. act

B. active

C. action

D. actor

6. He would never do anything to _______ the lives of his children.

A. danger

B. dangerous

C. endanger

D. endangered

7. If the product doesn't work, you are given the _______ of a refund or a replacement.

A. choice

B. choose

C. chooser

D. choosing

8. We saw a quick film showing the various stages in the _______ of glass.

A. produce

B. producer

C. products

D. production