In the street I met theprofessor_______gave us a talk last week.

27．To shut your eyes to facts．as many of you do,_______foolish

Studies show that people are more _____ to suffer from back problems if they always sit before computer screens for long hours.

You’ve left the light on—OhSo I have________and turn it off

All people, whether they are old or young, rich or poor, have been trying their best to help those ______ after the disaster.