missing

"My teacher explained the new math concept, and I understood it perfectly. "

"The cake recipe lists flour, sugar, and eggs as the main ingredients. "

"The student's essay had a few shortcomings in research and organization. "

"The scholarship offered a valuable opportunity for students to pursue higher education. "

"My perception of the teacher's instructions was that they were quite demanding. "

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

"Attendance at the meeting is required."

"The nervous student sputtered out his answer to the teacher's question. "

"The combustion of wood in the fireplace kept the room warm. "

"My grandmother used a spreadsheet to track the monthly expenses for her household. "

"My occasional helper at the bakery is a retired teacher. "

"We have to get people out of their cars and encourage them to use alternative forms of transportation."