preferred, prefers, is, are, was, were During the holiday week,

preferred, prefers, is, are, was, were
During the holiday week, one-third of the students in our class ___ prepared to stay on campus for study while around ten percent of them ___ some more sleep at home.
【正确答案】：were;preferred
【题目解析】：【考点点击】本题考查主谓一致和过去时。【要点透析】第一个空前面的主语为students所以谓语动词用复数,又因陈述的是过去的事情,所以用过去式were; while是并列连词,前后时态应保持一致,因此用 preferred