Chọn một từ thích hợp trong ô dưới đây điền vào mỗi chỗ trống để hoàn thành đoạn văn sau.

better | making | in | bring | pollution

If you live in a city, you will probably see many people; hear the noise of traffic and smell the (31) ______ from cars and factories. We are living in a new era in the history of the world. Before this, most people were farmers. They lived in small communities (32) ______ the country. Now many people are leaving the farms and moving into the cities. They are looking for (33) ______ job. As a result, the cities are growing quickly. Most cities are becoming more crowded. People are driving more cars, burning more fuel, using more water, eating more foods, (34) ______ more garbage, and producing more things in factories than ever before. Life in modern cities can (35) ______ many opportunities, but also many difficulties.

(32) ______