Unit 21.

Exercise 1

1. sum

2. vein

3. relate

4. chronicles

5. copper

6. millennium

7. background

8. venom

9. trustworthy

10. update

Exercise 2

1. c

2. d

3. a

4. a

5. a

Exercise 3

Part A

1. f

2. i

3. j

4. e

5. b

6. a

7. h

8. c

9. d

10. g

Part B

1. e

2. d

3. b

4. f

5. i

6. a

7. h

8. c

9. j

10. g

Reading Comprehension

Part A

1. F A teller at a bank thought her fellow employees were stealing.

2. T

3. F The venom was taken from a poisonous snake.

4. T

5. F Three of her coworkers were scratching their hands and arms.

6. T

Part B

1. d

2. b

3. c

4. d

Unit 22

Exercise 1

1. mocking, temper

2. scribes, unity

3. hitchhiked, cozy

4. charity, goods

5. heeded, neutral

6. empire, commerce

7. victor, throne

8. reduced, pity

9. persecuted, economy

10. depleted, condemned

Exercise 2

1. goods

2. depleted

3. charity

4. persecuted

5. victors

6. hitchhiked

7. mock

8. reduced

9. unity

10. empire

Exercise 3

1. c

2. b

3. d

4. a

5. c

Reading Comprehension

Part A

1. T

2. F The trees were important to the western areas' economy.

3. T

4. F The emperor sat upon his throne, and the scribe stood in front of him.

5. F The emperor condemned the citizens of the western areas to starve.

6. T

Part B

1. b

2. c

3. d

4. a

Unit 23

Exercise 1

1. b

2. d

3. a

4. a

5. d

6. c

7. d

8. d

9. c

10. a

Exercise 2

Part A

1. g

2. d

3. f

4. h

5. j

6. e

7. b

8. i

9. a

10. c

Part B

1. b

2. e

3. j

4. f

5. c

6. i

7. d

8. g

9. a

10. h

Reading Comprehension

Part A

1. T

2. F A tiny insect may have been the biggest factor in the death of these huge creatures.

3. T

4. F A vast majority of dinosaurs, from the vegetarians to the meat eaters, died.

5. F In addition, scientists have found the genetic material of mosquitoes in fossils.

6. T

Part B

1. d

2. a

3. b

4. a

Unit 24

Exercise 1

Part A

1. c

2. b

3. a

4. d

5. d

Part B

1. c

2. d

3. b

4. d

5. a

Exercise 2

1. cherish / moderation

2. growl / predator

3. sane / compassion

4. snatch / saucer

5. core / foster

6. cunning / grind

7. tumbled / dizzy

8. withhold / consent

9. tense / stumble

10. equilibrium / stagger

Reading Comprehension

Part A

1. T

2. F The innkeeper staggered outside.

3. T

4. T

5. F He did not want to withhold the truth any longer. He just wanted to foster happiness.

6. T

Part B

1. d

2. b

3. d

4. a

Unit 25

Exercise 1

Part A

1. c

2. a

3. d

4. c

5. d

Part B

1. c

2. c

3. b

4. b

5. b

Exercise 2

1. b

2. b

3. b

4. b

5. d

Exercise 3

1. hardy / traverse

2. celebrity / institute

3. migrate / aircraft

4. jealousy / esteemed

5. extinct / swamp

6. species / secluded

7. decisive / ethical

8. zoology / nurture

9. rural / overhead

10. principle / concrete

Reading Comprehension

Part A

1. F The journey on the aircraft to Australia took twenty hours.

2. F Gilbert was a professor of zoology.

3. F Gilbert was hardier than Eliza.

4. T

5. T

6. T

Part B

1. b

2. c

3. a

4. a

Unit 26

Exercise 1

Part A

1. b

2. b

3. c

4. a

5. b

Part B

1. c

2. d

3. c

4. b

5. a

Exercise 2

Part A

1. e

2. h

3. i

4. a

5. j

6. c

7. f

8. g

9. d

10. b

Part B

1. h

2. g

3. d

4. e

5. c

6. f

7. i

8. b

9. j

10. a

Reading Comprehension

Part A

1. T

2. F It was impossible for the colonel to extinguish the fire on the plane.

3. F The plane did not have any gasoline left after the crash.

4. T

5. F The couple searched for help in the forest for three days.

6. F The forest people led Wilbur and Mary through the trees and they promptly arrived at a small town.

Part B

1. a

2. a

3. c

4. b