The answer would be the 3rd sentence.
<span>Gideon and Francis took a difficult - but not interesting - science course.</span>
In Act V, scene III of Romeo and Juliet, Paris represents an outside pressure that escalates a conflict because Paris wants to wed Juliet, but before they get to meet each other Juliet falls for Romeo. They get secretly married by Friar Laurence.
Her parents want her to marry Paris, he goes to ask to the same Friar to marry him with Juliet.
Answer:
This sentence:
While hundreds of new hair and beauty products enter the market every year: sometimes the oldest solutions are still the best.
Is incorrect.
Explanation:
The reasons this sentence is incorrect are two. First of all the colon is used incorrectly. Because it is used to provide specific information that falls into a category that is produced by the sentence before the colons. However, in our case we don't only receive an example of that category's elements. But an explanation. And explanations shouldn't be introduced by colons. They should be followed by them, making it very clear the following elements are part of the category presented.
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