Every Tuesday morning, Katherine Larrabee boards a school bus with no more than five or six other students in tow. After a 20-minute masked ride, she reaches Hampden Academy by 7:45 a.m., sanitizes her hands as soon as she enters the building and goes directly to her first class. After a spring semester spent learning remotely, the 14-year-old sophomore has been happy to return to the school building this fall, even for just two days a week. “It’s been really nice just to be back in the whole school environment,” she said.