[ Grammar ]
The scientist usually works in his lab __________ the sun sets.
A. until
B. as soon as
C. although
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Grammar › ViewHow many students in your class _________ from Korea?
A. comes
B. come
C. are coming
D. came
Grammar › View
— is your grandfather?
He is 90 years old
A. How old
B. How far
C. How long