----I’m sorry, but there is no smoking on this flight.----Oh, I _____ that. Sorry, I won’t again.
Do you know that _______ with wise men improves your mind?
Only ______ a human being.
You’ve done much of the work, and please leave ______ to us.
The experts advise _______ our army _______ modern weapons.
It ______ at the crossroads ______ he was killed in the accident the other day.