The material carbon fiber is prized for its strength because ...

★ TOEFL Adjective and Adverb

The material carbon fiber is prized for its strength because it does not weaken . . . exposure to moisture.

A. upon

B. when

C. nor

D. but

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. . . the world population growing rapidly, sustainable farming practices are becoming essential.

A. With

B. Once

C. If

D. But