Read the following passage and decide which option A, B, C, D best fits each space
Man has always depended on plants ______(1) food and many other useful products. For this reason, farming is one of the world's most important industries. At first, _____(2) man did not know how to plant seeds and raise crops. He _____(3) wild fruits and vegetables where he found them. Then man discovered how to grow his own food. He_____ (4) seeds and waited for the crop to grow. For the first time, he could be reasonably sure of his food supply. He could settle down and set up shelters in the places_____ (5) he grew food.
As populations began to increase, the ______(6) for food became greater. Old-fashioned tools and farming methods were insufficient in _____(7) the demand, so man cultivated more and more land and invented complicated machines to make his work easier. Tractors replaced horses and other farm animals. Scientists studied and _____(8) with plants. They told farmers how to control plant diseases, and how to grow bigger and better crops. Now one man, _______(9) a wide knowledge of plants and the help of machines, can cultivate hundreds of acres. He can raise plants which did not originally grow in the soil or ______(10) of his community.
Trả lời câu hỏi dưới đây:
_______(7)