[ Vocabulary ]
Dark areas on the Sun’s photosphere that result from variations in the Sun’s magnetic field are?
A. Sunspot
B. Black hole
C. Solar flare
D. Solar black spot
Select your answer:
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Punctuation › ViewWhat does the apostrophe in “the boys’ school” indicate?
A. Plurality
B. Possession
C. Abbreviation
Modals › View
Choose the best modal to complete the sentence:
On the door was a no disturb sign so I ___ enter now.
A. must not
B. cannot
C. need to
D. should