36、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

37、Our family  a happy one.

A．is            B．are                 C．was                D．were

38、Most of the mistakes  because of carelessness.

A．were made     B．are made C．has been made    D．were making

39、Most of his time                 in reading novels.

A．are spent        B．is spent          C．were spent     D．was spending

40、The rest of the novel   very interesting.

A．were        B．are                 C．is                   D．seem

36、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。

37、A

38、A

39、B  。

40、C  这部小说的剩余部分，还没超出“一”，用单数。