Question 10: Many birds will, in the normal course of their migrations, flying more than three thousand miles to reach their winter homes.

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Explanation: In the sentence, “in the normal course of their migrations” is a supplementary adverb that does not determine the subject and verb. The subject of the sentence is “many birds” and the verb “will fly” is wrong.

Edit: flying -> fly

During their migration, many birds will fly more than 3000 miles to reach their winter shelter.