gathering

"The asteroid belt consists of a collection of dust, rubble, and minor planets."

"The engineers designed a new water filtration system for the school. "

"The students' generous contribution of old books to the school library helped many others. "

"My family has a different ideal for my future than I do. "

"Scientists study plants to understand how they grow. "

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

"The picnic was cut short when we saw the stormclouds gathering on the horizon. "

"The doctor prescribed antibiotics to help fight the bacterial infection in my throat. "

"The cheese was left in the cave to be maturated for several months before being sold. "

"The operation of the new coffee machine is quite simple. "

"The cut on his knee became infected and suppurated, releasing yellowish pus. "

"The school's fundraising campaign was very charitable, raising money for underprivileged students. "