[ Science ]
Scientists have found only 2 substances in the whole universe. What are they?
A. Matter and Air
B. Oxygen and Mass
C. Matter and Energy
Select your answer:
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Modals and Responsibilities › ViewWe ___ arrive on time for the meeting.
A. must
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Laos and Cambodia have big plans for building up to 11 ______ on the lower Mekong.
A. dams
B. slogans
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