Professor Smith, along with his assistants, _____ on the project day and night to meet the deadline.

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

How did you ___ to paint the whole house in a week?

—So what is the procedure?—All the applicants ________ before a final decision is made by the authority.(2013·北京，32)

 Quantities of precious jewelry_____ buried_____ in the earth.