[ Conditionals ]
If we try to control pollution,it …………very expensive.
A. would be
B. will
C. is
D. will be
Select your answer:
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Past Continuous Tense › ViewSusan ______(play) the piano when someone knocked on the door.
A. was playing
B. is playing
C. play
D. played
Modal Auxiliary Verbs › View
Pema _____ working on his homework.
A. is
B. am
C. does
D. are