The amount of light entering a room can be adjusted ...

★ TOEFL Adjective and Adverb

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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Virtually – – – plants need sunlight to perform photosynthesis.

A. All there are

B. All

C. All are

D. They all