Course of Grammer - Error
All the exercises of Common Expressions - easey, medium, and hard - doesn't match with the lessons about Frequently Confused Words, in fact, the exercises it's about preposition; however, it should be relative to Confused Words.
I hope that time I was cleared enough now, and sorry for any mistake in grammar, i'm still very raw in grammar.
The url is: https://www.khanacademy.org/humanities/grammar/usage-and-style
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