In the plane crash accident, the chance of the pilots’ survival is ______. 

________ other good students，in my opinion，Tom is ________ student.

(2009安徽合肥质检)Having failed in many attempts，the bird       managed to escape from the cage．

A best friend is one who can always read your minds when you are at a loss for the ________ words to complete your thoughts.

 The work was difficult, but Tom’s          expression showed that he would finish it in time.