Millions of people around the world suffer from a painful addiction to biting their nails,which can be harder________than smoking cigarettes.
—Have you __________ ? —No. I had the wrong number.
Ladies and gentlemen, please remain __________ until the plane has come to a complete stop.
I like this house with a beautiful garden in front , but I don’t have enough money to buy__________.
He told us whether _________ a picnic was still under discussion
1. —May I open the window to let in some fresh air ? —___________