The key to exercise solutions in chapter 4.5 - Grammar for the textbook Focus 4 - Workbook with authors Daniel Brayshaw and Beata Trapnell from Pearson Education
Question
Cross out to where it is not necessary.
Answer
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You'd better to avoid the dark backstreets late at night unless you want to get into trouble.
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Visitors simply must to experience the vibrant nightlife of Rio during the week of carnival.
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