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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A. The most great
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C. The greatest
D. The great
E. The most greatest

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. Apply future perfect tense: By 2025, I (to complete) my degree.

A. By 2025, I have completed my degree.

B. By 2025, I had completed my degree.

C. By 2025, I will have completed my degree.

D. By 2025, I will complete my degree.

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The closest in meaning to rarely is:

A. sometimes

B. seldom

C. frequently

D. never