1.Does the way you thought of to make the water clean make any sense?
2.When I caught him cheating me,i stopped buying things in his shop.
3.It was playing computer games that cost the boy a lot of time that he ought to have spent on his lessons.
4.the students are forbidden,unless they have special passes,to stay out after 11pm.
5_Why was a class meeting held?
_To elect a new monitor.