3 . There _______________ three books and a pen on the desk.
桌子上有三本书和一支钢笔。

4 . Either you or one of your students _______________to attend the meeting that is due tomorrow.
你或者你的一名学生应该出席明天的会议。

5 . Not only John and Tom but also their sister, Mary, _______________ great interest in the piano lessons.　
不仅是约翰和汤姆，就连他们的妹妹玛丽，也对钢琴课有极大的兴趣。

6 . Three thousand dollars _______________quite a lot of money for a boy.
对于一个男孩来说，3000美元是一笔大数目。

7 . The number of people invited _______________ one hundred, but a number of them ______________ absent for different reasons.　
收到邀请的总共有100人，但很多人因为各种原因缺席了。

8 . With more forests being destroyed, huge quantities of good earth _______________ being washed away each year.
由于更多的森林被毁，每年有大量的沃土被冲走。

9 . A quantity of time _______________ been wasted on the project.
大量的时间被浪费在了这个项目上。