Complete the passage by writing in each blank with ONE suitable word. (1,5pts) Rivers are on of the world’s most important natural resources. Many cities are on the large rivers, and (1)………….. every country has at least one river that plays an important part in the lives of its people. Besides transportation, rivers (2)………………..water for crops, water to drink , and recreation for people who live along their (3)………….. And in order to get water for crops, engineers sometimes build a dam across a river and let water become a lake behind the dam. Then people can use their water not (4)……………..to irrigate fields but also to make electricity for homes and industries. (5)………….the water often becomes polluted when cities on river bank grow inside and the number of industries (6)............... We are learning that it is necessary to keep rivers clean if we want to enjoy the benefits of the natural resources. `=>` Có mẹo nào để giải dạng bài này không ạ ?