EXERCISE 23
1. (no change)
2. We enjoyed Mexico City, where we spent our vacation.
3. An elephant, which is the earth’s largest land mammal, has few natural enemies other than human beings.
4. (no change)
5. At the botanical gardens, you can see a Venus’s-flytrap, which is an insectivorous plant.
6. (no change)
7. One of the most useful materials in the world is glass, which is made chiefly from sand, soda, and lime.
8. Glaciers, which are masses of ice that flow slowly over land, form in the cold polar regions and in high mountains.
9. (no change)
10. Petroleum, which some people refer to as black gold, is one of the most valuable resources in the world today.
11. You don’t have to take heavy clothes when you go to Bangkok, which has one of the highest average temperatures of any city in the world.
12. (no change)
13. Child labor was a social problem in late eighteenth-century England, where employment in factories became virtual slavery for children.
14. (no change)
15. The man, who was wearing a plaid shirt and blue jeans, was caught shortly after he had left the bank.
16. The research scientist, who was well protected before she stepped into the special chamber holding the bees, was not stung.
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