In the following three passages, some of the words have been left out. First read the passage over and try to understand what it is about. Then fill in the blanks with the help of the alternatives given.
Passage III:

One of the major causes of the failure of 66 countries on the economic front is their  67  to evolve a judicious mixture of 68 substitution and export promotion. Today, Bambia, which  69 on imports after its independence 20 years, 70 .