I think he falls asleep already, _________ I’m not completely sure.

The number of people in the world ________ about 6 billion and large quantities of waste ________ each year.[ ]

A successful life is a life ____challenges are met and difficulties overcome.

John is very ______ .—if he promises to do something he’ll do it.

John was fired by his factory and only then ________ how wrong he was to be lazy and careless.[ ]