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Rivers are on of the world's most important natural resources. Many cities are on the large rivers, and almost every country has a least one river that plays an important part in the lives of its people. Besides transportation, rivers provide water for crops, water to drink, and recreation for people who live along their banks 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 only to irrigate fields but also to make electricity for homes and industries. However the water often becomes polluted when cities on river bank grow in size and the number of industries increases. We are learning that it is necessary to keep rivers clean if we want to enjoy the benefits of the natural resources.
Rivers are one of the world's most important natural resources. Many cities are on the large rivers, and (1).............almost..................... every country has a least one river that (2)................plays................... an important part in the lives of its people. Besides transportation, rivers (3)....................provides................... water for crops, water to drink, and recreation for people who live along their (4)................banks......................... And in (5).............order................... to get water for crops, engineers sometimes build a dam (6).............behind....................... a river and let water become a lake behind the dam. Then people can use their water not (7)..................only.................. to irrigate fields but also to make electricity for homes and industries. (8).....................However,.................. the water often becomes polluted when cities on river bank grow (9)......................faster................. and the number of industries increases. We are learning that it is necessary to (10)...................keep..................... rivers clean if we want to enjoy the benefits of the natural resources.
Rivers are on of the world’s most important natural resources. Many cities are on the large rivers, and ……almost…….. every country has a least one river that …plays…….. an important part in the lives of its people. Besides transportation, river.......provide……………..water for crops, water to drink , and recreation for people who live along their ……banks…….. 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……only…..to irrigate fields but also to make electricity for homes and industries. ……However…….the water often becomes polluted when cities on river bank grow up and the number of industries increases. We are learning that it is necessary to ……keep……rivers clean if we want to enjoy the benefits of the natural resources.
Rivers are on of the world’s most important natural resources. Many cities are on the large rivers, and……almost…….. every country has a least one river that …plays…….. an important part in the lives of its people. Besides transportation, rivers …provide……………..water for crops, water to drink , and recreation for people who live along their ……banks…….. 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 ……only………..to irrigate fields but also to make electricity for homes and industries. ……However…….the water often becomes polluted when cities on river bank grow……in……….size and the number of industries increases. We are learning that it is necessary to……keep……rivers clean if we want to enjoy the benefits of the natural resources.
Đáp án: B
Giải thích: Dựa vào câu: “Air pollution can also make our Earth warmer”.
Dịch: Ô nhiễm không khí cũng có thể làm cho Trái đất của chúng ta nóng lên.
1, Yes, it is
2, We shouldn't throw trash into the rivers and lake to keep the water unpolluted
END. 
1. Yes, it is.
2. We shouldn't throw trash into the the rivers and the lake to keep the water unnpolluted.
GOOD LUCK !
a
c
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b
d