While editing a story you've written, you realize that you've used the word funny a number of times. How might you use a reference source to improve your word choice? Look up funny in the dictionary to find the meaning.
Look up funny in the dictionary to find the part of speech of the word.
Look up funny in a thesaurus to find synonyms to replace some of the words.
Look up funny in a thesaurus to find antonyms to replace some of the words.

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)