underwent

"Many times surgery is necessary to prevent cancer from spreading."

"The school's fundraising project aims to renovate the library in several stages. "

"Is anyone here afraid of suffering hardship?"

"The dry-stone wall used a large, flat through to support the top stones. "

"The construction workers built a tunnel under the road to avoid disrupting traffic. "

"I went to the park because the weather was nice. "

"The subway train is undergoing a tunnel underneath the city. "

"Despite the heavy rain, the students endured the long walk to school. "

"The product is undergoing a change in order to improve it."

"It was an experience he would not soon forget."

"The train slowly underwent the tunnel. "

"The books were stacked neatly beneath the desk. "