The dependent clause of the sentence is "If we are going to make it to the movie on time," because it depends on the next part of the sentence to make sense. Without the next half of the sentence, the clause left alone wouldn't make any sense. The other clause is independent, meaning that it still makes sense when it stands without the dependent clause.
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The correct answer is letter D. One-third. The basic grammar rule in spelling out fractions should always have a hyphen. The words one and third separately mean differently. One connected by hyphen with the word third, creates a new word and different definition, meaning, a numerical quantity.
