Đọc kĩ đoạn văn sau và chọn phương án đúng (ứng với A hoặc B, C, D) cho mỗi chỗ trống

The history of farming    

     Before people started farming, they went to the forest to look (19) ______ plants or fruit they could eat. This meant were moving all the time to find food. But about 12,000 years (20) ______, in the Middle East, people began to grow food. These people were first farmers. Farming made it possible for people to (21) ______ in one place and slowly their villages got bigger.          Some people in the villages became free to do other work, like making clothes (22) ______ the farmers could grow food for everyone. Unfortunately, farming was difficult when the weather was bad and then some people did not get enough food to eat. Today, farmers can (23) ______ more food and it travels thousands of kilometers from where it is grown to our homes.

Before people started farming, they went to the forest to look (19) ______ plants or fruit they could eat.