Page 90 - BUDDY 7 Activity Book

Answer Key

10. 1. to buy a guitar UNIT 10 - Planets
2. to buy fruit and vegetables
3. to buy medicine 1. 1. telescope 2. gravity 3. moon
4. to report a crime 4. space shuttle 5. solar system 6. satellite
88 5. to have fun 7. meteor shower 8. observe 9. orbit
6. to see paintings
2. 1. A 2. B 3. A 4. A 5. B 6. A 7. A 8. B
11. 1. She took a shower.
2. To walk her dog. 3. 1. solar system 2. sent 3. orbits 4. evidence 5. observe
3. To do shopping. 6. samples 7. planet 8. black hole 9. proof 10. gravity
4. She went there with Mary.
5. They went to the bookstore. 4. 1. produces 2. think 3. sent 4. has 5. wants
6. She had dinner and watched TV with her parents. 6. stepped 7. discovered 8. watched 9. observes 10. landed

5. 1. large – larger – the largest
UNIT 9 - Environment 2. big – bigger – the biggest
3. hot – hotter – the hottest
1. 1. water pollution 2. noise pollution 3. soil pollution 4. air pollution 4. cold – colder – the coldest
2. 1. a 2. b 3. b 4. a 5. small – smaller – the smallest
6. close – closer – the closest
3. 1. b 2. d 3. a 4. f 5. c 6. e
7. far – farther/further – the farthest/furthest
4. 1. They provide oxygen and clean air for people and animals. They are 8. interesting – more interesting – the most interesting
habitats of thousands of species. They help to reduce the greenhouse
effect. 9. light – lighter – the lightest
2. Many animals die or become extinct because they lose their natural 10. fast – faster – the fastest
habitats. The increase of carbon dioxide causes climate change. 11. long – longer – the longest
Pollution increases. 12. slow – slower – the slowest
3. Students’ own answers. 13. short – shorter – the shortest
5. 1. B 2. A 3. C 4. B 5. A 6. C 7. A 8. B 9. B 14. strong – stronger – the strongest
15. heavy – heavier – the heaviest
6. Students’ own answers.
16. tall – taller – the tallest
7. 1. polluting 2. taps 3. litter 4. classify 5. materials 17. fantastic – more fantastic – the most fantastic
6. negative 7. hunting 8. destroy 9. trees 10. threaten 18. weak – weaker – the weakest
8. Students’ own answers.
6. 1. weaker than 2. the smallest 3. hotter than 4. larger than
9. 1. T 2. F 3. F 4. T 5. F 6. T 7. T 8. F 9. F 10. F 5. lighter than 6. the longest 7. colder than 8. the slowest
10. 1. use 2. Turn 3. using 4. have 5. prevent 9. bigger than 10. the tallest
6. negative 7. Don’t 8. bad 9. reduce 10. have 7. 1. B 2. A 3. B 4. B 5. B 6. A 7. B

11. 1. We have to buy energy efficient vehicles. 8. 1. was 2. helped 3. became 4. began 5. learned 6. entered
2. People should use renewable sources.
3. We have to take precautions to save energy. 9. 1. EARTH 2. SATELLITE 3. MARS 4. UNIVERSE 5. GALAXY
4. Why do people cut down trees? 6. EVIDENCE 7. ORBIT 8. PLANET 9. NEPTUNE
5. What are the effects of global warming?

12. 1. T 2. T 3. F 4. T 5. F 6. F 7. F 10. 1. Mars 2. Mars 3. Saturn
8. T 9. F 10. T 11. F 12. T 13. T 14. T 4. Neptune 5. Neptune 6. Mars

13. 1. c 2. e 3. d 4. b 5. a 11. 1. T 2. T 3. F 4. F 5. T 6. T 7. F 8. F 9. T 10. T

14. a. 5 b. 6 c. 2 d. 3 e. 1 f. 4