Water is very important for us and no one can live ______________ it.
We must do something important to stop the pollution ____ a happy life.
— We didn’t _____ the match. — What a pity!
I like talking with the girl ______ plays the piano _______.
He tried to make himself ________ by his students, but he failed.
--- I _____ read this book _____ I understand it. --- You are great, I should learn from you.