Supermarkets are necessary. People usually spend less time ____things they want, but they usually spend more on things that they don't need.
Don’t ______ that all these who get good grades in the entrance examination will prove to be most successful.
She tried to make ____ clear that she had nothing to do with what happened in the school, but in vain.
--If he _____that the mushroom was poisonous, he _____ it. --Luckily he was sent to the hospital immediately.