(i) 'Utters': The word "utters" refers to the act of speaking, which is the key verb in this context. In the passage, when the author describes a person expressing frustration by hitting his thumb and speaking curses, the verb used is "utters." It means to say something aloud or speak. This is the word that corresponds to "speaks." Notice that "speaks" here is used in a very informal or emotional context (utterances of curses), which is why "utters" is the correct term.
(ii) 'Influence': The word "influence" is used in the passage to signify the power to affect or change people's behavior. It also carries the meaning of authority or control, both of which are associated with power or success. When the author discusses how language enables humans to influence behavior, it suggests that language is a potent tool for shaping actions and outcomes—similar to being powerful or successful. Hence, the word "influence" can be interpreted as meaning "powerful" or "successful" in the passage. The term shows how language can bring about changes in society and human behavior, making it a pivotal factor in success.
(iii) 'Strengthen': In this context, the opposite of the word "aggravate" is "strengthen." The word "aggravate" means to worsen or intensify a situation, making it more difficult or problematic. On the other hand, "strengthen" means to make something stronger or better. In the passage, "strengthen" is used to describe how language helps in reinforcing the bonds between members of society, making them more cohesive and unified. Therefore, "strengthen" is the opposite of "aggravate" because it denotes improvement, whereas "aggravate" suggests deterioration.