[ Grammar ]
It _____ working.
A. am not
B. is not
C. are not
D. not

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Vocabulary › ViewAt right angles to a horizontal plane; in a direction, or having an alignment, such that the top is directly above the bottom is the definition of what word?
A. upright
B. vertical
C. perpendicular
Grammar › View
Select the correct spelling.
A. karbon
B. carbon
C. carbone
D. carbonne