Our school was ________ in 1925 and has a history of more than 80 years.
I think he is taking an active part in social work. I agree with you ______ .
Experts have been warning _____ of the health risks caused by passive smoking.
He was told that it would be at least three months ___ he could recover and return to work.
Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.
We had to wait half an hour _______ we already booked a table.