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"Regular maintenance of the school's computers ensures they are always working properly. "

"There was a requirement of the government on citizens for paying taxes."

"The combination of soft music and warm lighting created a relaxing atmosphere in the living room. "

"The students are engineering a new system for managing their study group projects. "

"My grandmother visits my family periodically, usually once a month. "

"The school's new restriction on cell phone use during class improved student focus. "

"The temporary at the bakery was only there for the summer. "

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

"The teacher pointed out a particular detail in the math problem that several students missed. "

"a successful use of medicine;  a successful experiment;  a successful enterprise"

"The river overflowed the levee."

"Her diligence in studying resulted in excellent grades. "