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"My classmate Sarah and I are working on a science project together. "

"The used car salesman was deceitful; he lied about the car's history to get a higher price. "

"There is a possibility that the school will have a field trip next week. "

"Except for one or two days a year, he usually walks to work."

"She was worried about her son who had been sent off to fight in the war."

"He spread his newspaper on the table."

"Could you please scratch my back?"

""Many students have problems understanding fractions." "

"The teenagers were gossiping about who had a crush on whom at the school dance. "

"The parasitic capacitance in the circuit caused unexpected delays in the computer program's execution. "

"Cheating on a test is a contemptible act that deserves punishment. "

"The lightning caused thunder."