[ Grammar ]
There was an explosion in technology _____ the beginning of the 20th century.
A. in
B. at
C. through
D. on

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Grammar › ViewWhich sentence uses the correct article?
A. A life cycle of a star has several stages.
B. An life cycle of a star has several stages.
C. The life cycle of a star has several stages.
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You use the expression BY THE TIME with:
A. Present Perfect
B. Past Continuous
C. Past Perfect
Grammar and Vocabulary › ViewObviously, I’d be … of that list.
A. in search
B. in trouble
C. in charge
D. on the top
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Ronnie doesn’t see well. He ______________wear glasses.
A. can
B. should