The number of people invited ___fifty, but a number of them____ absent fordifferent reasons．

 The writer and professor, whom I often refer to at the meetings, ____ famous for those works. 

.John is the only one of the students in the class that never______ a mistake even when it is pointed to him.

Jack, together with his sisters,_____ great interest in writing these days. 

Either you or I _____ going to attend the meeting in the afternoon.