He opened the door. There ________ he had never seen before.
—How much do I owe you for lunch? —________________. It’s nothing.
It ________ that their plan was practical and successful.
It is considered a good way for students to ________study with pleasure.
It is known to all that a proper amount of exercise ________ to good health.
I have read the material several times but it doesn't make any ____ to me.