★ TOEFL Adjective and Adverb
Mainly important for its chemical reactivity, chlorine can be used . . . water.
A. to sanitize
B. for sanitation
C. and sanitizing
D. sanitizes
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The amount of light entering a room can be adjusted . . . the installation of new windows.
A. it is to be
B. when
C. during
D. meanwhile
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