When you make an inference, you combine what you read with __ the author’s point of view.
the details in the text.
what you already know.
what you want to learn.

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a. "to practice" is the best phrase to complete the sentence.

explanation:

during the summer, she likes to practice her soccer skills so that she is ready to play in the fall.

(note that : all the other options "the practicing of", "practice for" and "to do a practice on" are inappropriate as they make the sentence grammatically incorrect.)