you finished your work —Yes. Actually, I _______ it before you came.

He knows so much about Russia that he’s universallyacknowledged as a _____ on Russian affairs.

______ it______ for your help，I couldn’t have made any progress．

Could I use your dictionary?—Sorry, it __________

Being a doctor is one of the few professions＿＿＿＿if you make a mistake，it canmean somebody’s life