[ Coordinating Conjunctions ]
The price of the equipment is low, …. the maintenance can be high.
A. or
B. and
C. but
D. either

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Past Tense › ViewWhen I got home, my parents ____________on the sofa.
A. was siting
B. were siting
C. were sitting
D. was sitting
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Before the concert, they ______ (already/perform) three songs.
A. Had already performed
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A. had been catching
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We need ——- light in the room.
A. a
B. an
C. the
