It is difficult for us to learn a lesson in life_________we’ve actually had that lesson.
_____it with me and I'll see what I can do.
They_____the train until it disappeared in the distance.
-Can I get you a cup of tea? --_____.
Professor White has written some short stories, but he is _____ known for his plays.
.Nobody noticed the thief slip into the house because the lights happened to_____.