In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.
Passage:

Can you (1)............ a world without human beings? Who but humans (2)............. have utilized the resources and created a (3)............ and cultural environment? The people living in a country are imp ortant to (4)............ the economy and the society. They (5)......... are the greatest resource.