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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Lucy _______ her leg, so she can’t come skiing.

A. Has broken
B. Broke
C. Have broken

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The closest in meaning to rarely is:

A. sometimes

B. seldom

C. frequently

D. never