The hotline_________ be very busy，but keep trying and you’ll get through．

 —Good morning.I've got an appointment with Miss Smith in the Personnel Department.—Ah，good morning.You ________ be Mrs.Peters.(2010·北京)

Until the start of the Industrial Revolution, mankind was poor, hungry, and constantly at the _______ of disease and natural disasters.

It _________ you to at least 50% off the regular price of either frames or lenses when you buy both.

People generally believe that women are more emotional than men, but in my experience that often isn’t the ______.