Which sentence uses a pair of synonyms? Because there was so much shouting, many of the protestors began screaming in order to be heard. Although we were tired after the long hike into the woods, we were still energetic enough to make camp. Despite all the exercise and the healthy eating habits, she still felt sick when she woke up in the morning. The children were too excited about the next day to settle down in their peaceful surroundings.

Synonyms are words that are similar, or have a related meaning, to another word.

Antonyms are words that have an opposite meaning to an another word.

Because there was so much shouting, many of the protestors began screaming in order to be heard.

Shouting and Screaming are synonyms.

In the other sentences, pairs of antonyms were used.

Second sentence: Tired × Energetic

Third sentence: Healthy × Sick

Fourth: Excited × Peaceful

Hope this helps you...

Hope you have a nice day ahead...