| plays | across | however | keep | almost |
| order | provide | only | banks | ord |
Rivers are on of the world’s most important natural resources. Many cities are on the large rivers, and =-... every country has a least one river that =-.. an important part in the lives of its people. Besides transportation, rives ==.. water for crops, water to drink, and recreation for people who live along their =... And in =-.. to get water for crops, engineers sometimes build a dam =-... a river and let water become a lake behind the dam. Then people can use their water not =-.. to irrigate fields but also to make electricity for homes and industries. -.…………. the water often becomes polluted when cities on river bank grow =-. and the number of industries increases. We are learning that it is necessary to rivers clean ==.. if we want to enjoy the benefits of the natural resources.
