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Please answer the question below.

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Which sentence correctly uses the phrase a lot of?

She learned a lot of programming languages.

He has a lot of careful in his work.

The word careful is an adjective, not a noun. A lot of should be used with nouns.

I have a lot of idea for the new app.

The countable noun idea should be in its plural form when used with the phrase a lot of.

She has a lot of the most experience in our team.

When comparing qualities, more or most is appropriate, not a lot of.