Do you like to live in the countryside or in the city?  Why?

Rivers are on of the world's most important natural resources. Many cities are on the large rivers, and (1) ______ every country has a least one river that (2)______  an important part in the lives of its people. Besides transportation, rivers (3)______ water for crops, water to drink, and recreation for people who live along their (4)______ And in (5)______  to get water for crops, engineers sometimes build a dam (6)______  a river and let water become a lake behind the dam. Then people can use their water not (7)______  to irrigate fields but also to make electricity for homes and industries. (8)______ the water often becomes polluted when cities on river bank grow (9)______  and the number of industries increases. We are learning that it is necessary to (10______ rivers clean if we want to enjoy the benefits of the natural resources.

Reading scientific books is one of my interests.

=> I'm ______.

Tìm lỗi sai: In contrast to my brother is hardworking, I am quite a lazy boy.

Villagers are more kind, friendly and warm-hearted than city _______.

She put ______ speaking to him as long as possible.

When did you first know him?

=> How long ______?