[ Vocabulary and Grammar ]
Scientist use _ very strong telescope to help them look fat out into space.
A. a
B. an
C. the
D. any
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Grammar › ViewWhich of the following nouns is a thing?
A. doctor
B. pencil
C. nurse
D. teacher
Conjunctions › View
_______ John was watching television his wife was reading a book.
A. after
B. before
C. while
D. during