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The _____ opened the door to the hotel and carried the customer's luggage inside. 

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He wrote a(n) _____ about his life as an author, illustrator, and playwright. 

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When an animal in the wild develops a relationship with an animal of another species that benefits both animals, it is considered a(n) _____ relationship.

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Our teacher wrote an interesting _____about the life of Patricia Polacco, a famous author. 

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Instead of buying regular trash bags, my family now buys _____ trash bags because they are more environmentally friendly.

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Even though many plants and animals live on land, water makes up the majority of Earth's _____.

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It might be fun to research a pirate’s life and write a(n) _____about them. 

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The study of _____ is important so people can learn how plants and animals live and grow. 

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My dog protects me and I take care of him in return, so we have a(n) ____ relationship. 

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After the president left office, he wrote a(n) _____ , or a book about his own life.