11. Among sea horses, __________ carries and hatches the eggs in a special breeding pouch. a. it is the male which b. the male it c. it is the male d. the male who

2. __________ more than 2,000 minerals are known, nearly all rocks are formed from seven mineral groups. a. Although b. However c. Despite d. Since A

14. The discovery that electricity could produce magnetism __________ in 1820 by the Danish physicist, Hans Christian Oerested. a. by accident b. was an accident c. was made by accident d. by accident was

9. __________ food we eat lacks minerals, then the body can use the stores from its bones for more urgent needs. a. As the b. If the c. The d. Since

13. Scientists have discovered that the jellylike material in cells __________ proteins and other substances. a. is actually a complex mixture b. it is actually a complex mixture c. actually is a complex mixture of d. that actu

1. The behavior of many volcanoes __________ very difficult to predict, especially the more explosive types. a. are b. is c. that d. being

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10. __________ an organism to become a fossil. a. Rarely b. It is rare c. Rare is d. It is rare for

3. Alexander Graham Bell worked with deaf students before __________ the first telephone in 1876. a. designed b. was designed c. to design d. designing

7. Nicotine, __________ found in tobacco, is named after the French diplomat Jean Nicot. a. it is a chemical compound b. is a chemical compound c. a chemical compound d. chemical compound is

12. __________ will be increasingly used as a source of petrochemicals when oil begins to run out. a. No matter coal b. No doubt coal c. If coal d. That coal

8. __________ the world’s most successful artificial language. a. As Esperanto is b. That Esperanto c. It is Esperanto d. Esperanto is

5. Food of animal origin generally supply greater amounts of iron to the diet than __________ a. are foods of plant origin b. foods of plant origins c. do foods of plant origin d. plant origin foods