26、The boy sitting by the window is the only one of the students who from the countryside in our school.
　　A.are B.is C.were D.was
　　27、Our family a happy one.
　　A.is B.are C.was D.were
　　28、Most of the mistakes because of carelessness.
　　A.were made B.are made C.has been made D.were making
　　29、Most of his time in reading novels.
　　A.are spent B.is spent C.were spent D.was spending
　　30、The rest of the novel very interesting.
　　A.were B.are C.is D.seem

　　参考答案：
　　26、B 根据句意，这个男孩是学校中唯一来自农村的学生，自然后面的定语从句 的主语是单数，所以谓语动词用单数形式，又因主从句时态保持一致，故B 是唯一正确答案。
　　27、A
　　28、A
　　29、B 。
　　30、C 这部小说的剩余部分，还没超出“一”，用单数。