EXERCISE 11. Active vs. passlve. (Charts 10-1 - 10-4)
Directions: Complete the sentences with the correct forms of the verbs in parentheses.
Almost everyone (mjoy) ehiovs visiting a zoo. Today zoos are
"I ,
common. The first zoo (establish) around 3500 years ago
2
by an Egyptian queen for her personal enjoyment. Five hundred years later, a Chinese
emperor (establish) a huge zoo to show his power and wealth.
3
Later zoos (establish) for the purpose of studying animals.
4
Some of the early European zoos were dark holes or dirty cages. At that time, people
(disgust) by the bad conditions and the mistreatment of
5
the animals. Later, these early zoos (replace) by scientific
6
institutions where animals (study) and (kW
7
in good condition. These research centers fiecome)
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the fist modern zoos.
As early as the 1940s, scientists (understand) that
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many kinds of wild animals faced extinction. Since that time, zoos (try)
4' A'! ,r^11
to save many endangered species, but relying on zoos to save
species such as the rhinoce~os & not enough. In the 1980% the number of rhinos in the
world (reduce) 1 ,, from 10,000 to 400. Many rhinos (kilo(^12). (^1) i
....
by poachers, but many also (die) in
L&.^13 14
'- captivity. Zoo breeding programs for rhinos have not been successful. The best method of
conservation (be) to leave them in their natural habitat. By 1999,
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286 CHAPTER 10