<span>The sentence which needs a semicolon is : 5) Water is not everywhere it's miles away. When there are two or more ideas related ideas in a sentence, they can be joined by semicolon, in other words it is used to l</span><span>ink two </span>independent clauses in order to connect closely related ideas. The common idea is water, and this sentence should look like this: Water is not everywhere;it's miles away.
The only sentence here with an infinitive phrase is the first one, and the infinitive phrase there is 'to write'. You ask the question - What did Christa choose? in order to find the object of that sentence, and the answer is 'to write'.
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By providing text evidence
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