Here are the answers to your questions:
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The mountains of Colorado are a popular vacation destination.
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The sentence that has proper subject-verb agreement is: Missouri and Illinois are states along the Mississippi River.
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The group of words included in the sentence "because he was late, Fred missed the movie" is: dependent clause.
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The sentence that displays correct subject-verb agreement is: My collection of stamps is extensive.
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The sentence that contains a gerund is: Watching little league baseball is a favorite pastime of people who appreciate summer.
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The sentence that includes a participial phrase is: Staring down the mountain, Jack was excited for a day of skiing.
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The sentence that includes a prepositional phrase is: The test was moved to Wednesday.
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The sentence that has correct pronoun and antecedent agreement is: While the neighbors were walking to the store, they dropped their money and the wind blew it away.
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The sentence that includes a dependent clause is: When looking out the window, they saw the first leaf fall.
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The option that turns the sentence written in passive voice into active voice is: The team lost the game because the players made mistakes.
Feel free to ask if you have any more questions or need further clarification!