How do we use "must" and needed "have to" to express necessity / an advance for examples?

to save the day, harry must get past a scary three-headed guard dog.

its d! the final exam asked good luck

the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.  

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