[ Tenses ]
Polar bears ________ at the North Pole.
A. lives
B. lived
C. living
D. live
Select your answer:
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Vocabulary › ViewA scientific test or procedure that is carried out under controlled conditions to answer a scientific question.
A. experiment
B. observation
C. investigation
D. field study
Passive Voice and Modals › View
The kids _______________ drink water every day.
A. have
B. has to
C. must
D. could to