...........developed very rapidly in Alabama primarily because of its rich ...

★ Adverb and Noun Clauses

………..developed very rapidly in Alabama primarily because of its rich natural resources.

A. That heavy industry

B. Heavy industry

C. Heavy industry that was

D. When heavy industry

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Orbiting from 2.7 to 3.6 billion miles from the sun, …………………..

A. the astronomer Clyde Tombaugh discovered Pluto in 1930

B. Pluto was discovered by the astronomer Clyde Tombaugh in 1930

C. it was in 1930 that the astronomer Clyde Tombaugh discovered Pluto

D. the discovery of Pluto was made by Clyde Tombaugh in 1930