conserving

"Condoms are designed to protect against sexually-transmitted diseases."

"The accompanied minor was nervous about flying alone, but a flight attendant stayed with him until takeoff. "

"I brush my teeth regularly to prevent them from turning yellow."

"The student's excellent performance on the math test showed they had surpassed their previous scores. "

"My sometimes neighbor, a retired teacher, still visits the school occasionally. "

"The noisy environment of the school cafeteria made it difficult to concentrate on my homework. "

"The conservation of natural resources is important for future generations. "

"The teacher un-changed the grade, reverting it back to the original score. "

"Her childhood memories of playing hide-and-seek with her siblings were happy and vivid. "

"Wang said such changes to the Baishui glacier provide the chance to educate visitors about global warming."

"The juice box contains a preservative to keep it fresh until the end of the school day. "

"The careless driver endangered the children walking to school. "