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"The bouncy ball was perfectly spherical. "

"The science teacher conducted an experiment to demonstrate how plants grow in different types of soil. "

"The juice box is a small container for the children's drinks at school. "

"The science students conducted their experiments in the school laboratory. "

"My sister is very helpful, especially when it comes to organizing things. "

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"The fireworks display used gunpowder to create colourful explosions. "

"The teacher positioned the globe on the table so the students could see it easily. "

"She discreetly packed her belongings before leaving the room. "

"The old thermometer contained quicksilver, which is another name for mercury. "

"After the party, we carefully packed the glassware to prevent it from breaking. "

"After years of struggling with addiction, he finally admitted he was an alcoholic and sought help. "