You didn’t use to like him much when we were at school, ___________?

I don’t think he could have done such a stupid thing last night, _____?

If _______, I will go to visit your new house tomorrow. 

Depression is the leading cause of suicide, __    __ in turn is the third leading cause of death among 15 to 24 year olds in the United States．

 It was quite a long time      I made it out what had happened.