[ Vocabulary ]
the layer of gases that surrounds Earth
A. biosphere
B. hydrosphere
C. atomosphere
D. geosphere
Select your answer:
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Irregular verbs › View3rd form of know
A. knowed
B. knew
C. known
D. knewed
Grammar › View
Which question correctly asks about multiple people’s actions?
A. What is they doing?
B. What are they doing?
C. What does they doing?
D. What they are doing?