[ Vocabulary ]
More than a billion people all over the world are under the threat of desert .
A. ncrease
B. expansion
C. development
D. extension
Select your answer:
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Grammar › ViewI _________ a book when I heard the noise from the garden.
A. am reading
B. was reading
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Vocabulary and Grammar › View
Select the correct preposition: He is proficient ________ multiple languages.
A. in
B. at
C. on
D. to