2 Read and complete the sentences with the words.<br />life, needs, ecosystem, changed, future, invented, technology, sources<br />Human environment is a man-made en-invented new technologies. Communication<br />vironment. It was (1) ... by humans for their became easier and fast across the world<br />needs. Before (2)<br />appeared, humans They formed a man-made (5)<br />lived in the natural environment. They had<br />We need a balance between the natural<br />an environment-friendly life. With time, their and man-made environment. If we use the<br />(3). grew and grew. Humans learnt new natural (6) wisely, we can have a heal-<br />ways to change their environment for their thy balance. We should use our resources<br />needs.<br />wisely and learn to save them. Natural re-<br />They learnt to grow crops and animals, and sources like wood, minerals, water and air<br />build houses. They (4) ... the wheel, money, are important for (7) If we do not use<br />trade and business. Transportation became them wisely, we may run out of them one<br />faster. It became possible after they had day. We should think about our (8)<br />​

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