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VI.Read the passage and mark the correct answer to complete the passage.
Rivers all of the world's most important natural resources. Many cities are on large rivers, and(1)
every country has at least one river that plays an important part in the lives and its people.
Besides transportation, rivers(2) food, water for crops, water to drink and opportunities for
recreation for people who live along their bank and in order to get water for crops engineer sometimes build
a dam(3)
a river and let the water become a lake behind the dam. Then people can use their water not
only to irrigate fields but also to make electricity for home and industries. However the water often
becomes(4) when cities on river bank grow inside and the number of industries increases. We are
learning that it is necessary to keep rivers clean if we want to enjoy the (5)
of the natural resources.