It’s so silly ________ people to buy and store so much salt. It’s necessary ________ them to learn more about salt.
Eddie _________ sleeping __________ going out.
It’s getting cooler. My mother opened the drawer to ________the clothes for summer.
A good teacher should be strict _______the students ______their study.
---The man in a black suit _______ be our youth worker. ---It _______ be him. I saw him in the classroom building some minutes ago.
How careless it was _______ Millie to make _______ many silly mistakes in the Math exam!