[ Vocabulary ]
A gas that is expelled from the body by the respiratory system.
A. nitrogen
B. mercury
C. carbon dioxide
D. oxygen
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Grammar › ViewI think I ________ a new calculator. This one does not work properly any more.
A. need
B. am needing
C. needed
D. needing
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He usually takes the bus, but these days he ___________ his car.
A. drive
B. driving
C. is driving