—Each of the students, working hard at his or her lessons, _________to go to university.—So do I. 

A number of students ______ playing on the ground but I don't know what the exact number______.

The students in our school expected ______ more time for reviews and exercises before the College Entrance Examination next year.

Every athlete as well as some coaches who ____ to go to the Games ____ asked to be here before 7:30 am.

We noticed that each animal and each tree in the park _____ being taken good care of.