—You were not listening；what troubled you?—I         my coming math exam．

—Will you attend the ceremony tomorrow?  —What ceremony? I ____ informed of anything about it．

The teacher told us that the sun ＿＿＿ in the east and ＿＿＿ in the west. 

 If a computer crashes,you will lose the file you _____ on unless you save it regularly.   

Traffic conditions in Beijing ________ for decades. At first people only complained about jams during rush hours，but today every hour is rush hour.