When Marie Curie discovered radium, the elements' properties and ...

[ Grammar ]

When Marie Curie discovered radium, the elements’ properties and potential were not fully understood.

A. NO CHANGE

B. the elements property’s and potential

C. the element’s properties and potential’s

D. the element’s properties and potential

Select your answer:
A B C D E

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C. Jack will called me.

D. Jack will call me tomorrow.

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A. filled

B. stuffed

C. overflowing

D. empty

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A. Has broken
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The closest in meaning to rarely is:

A. sometimes

B. seldom

C. frequently

D. never