[ Grammar ]
And in that way it has been proved that the radioactive elements are constantly ______ and that they produce at the end ordinary elements, principally helium and lead.
A. disintegrating
B. to disintegrate
C. being disintegrating
D. disintegrated
Select your answer:
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Apostrophe Grammar › ViewIdentify the correct placement of the apostrophe in the following sentence: The dogs tail wagged happily.
A. dogs
B. dogs’
C. dog’s
Narrative Tenses › View
When I saw Clara, I realized that she ____________ much in all those years.
A. didn’t change
B. wasn’t changing
C. hadn’t changed