. . . Clean Air Act was a policy enacted ...

★ TOEFL Adjective and Adverb

. . . Clean Air Act was a policy enacted in 1963 to regulate air pollution and protect human health and environment.

A. The

B. If the

C. When the

D. Whereby the

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Ceremonial rituals played a crucial role in . . . . ancient American Indian cultures.

A. many of which

B. many of

C. many of them

D. many