If you lose a customer, regret it _____ excuse it, or you will lose him for ever.
Some people who don't like to talk much are not necessarily shy;they ________ just be quiet people.
What do you mean,there are only ten tickets? There ________ be twelve.
—Good morning.I've got an appointment with Miss Smith in the Personnel Department. —Ah,good morning.You ________ be Mrs.Peters.(2010·北京)
I can't leave.She told me that I ________ stay here until she comes back.
—________ I take the book out? —I'm afraid not.