Select the Correct Past Participle for Each Blank

question 7

Multiple Choice

Select the correct past participle for each blank. Hand blown by the long defunct Shelby Electric Company, the light bulb has ____ its longevity through a special carbide filament no longer in use.

• A) maintain
• B) maintained

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Definitions:

Abundant Elements

Chemical elements that occur in large quantities in Earth's crust, atmosphere, or oceans, such as oxygen, silicon, and aluminum.

Calcium Carbonate

A chemical compound with the formula CaCO3, commonly found in rocks as the minerals calcite and aragonite and is the main component of pearls, the shells of marine organisms, snails, and eggs.

Protons

Positively charged subatomic particles found in the nucleus of an atom.

Neutrons

Subatomic particles found in the nucleus of an atom, with no electrical charge and a mass slightly greater than that of protons.