---How can you use my computer without my permission? ---Oh, I ________to tell you. I hope you don’t mind.
I would appreciate it________you call back this afternoon for the doctor's appointment.
________much advice I gave him, he did exactly what he wanted to do.
The research is so designed that once________nothing can be done to change it.
Visitors________not to touch the exhibits.
It is known to all that________you exercise regularly, you won't keep good health.