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

1. She is still reading. 2. We haven't seen her for a long time. 3. Grandparents have already visited their grandchildren. 4. Now they are sitting in the living room and talking about their trip. 5. Have you ever been to Africa? 6. He has already bought a house and is now going to buy a car. 7. The concert has not started yet, we are sitting in the hall and talking. 8. Wait for me! I didn't take the money. 9. I just had breakfast. 10. He's already had breakfast. 11. We haven't had breakfast yet. 12. They are still drinking tea in the cafeteria. 13. I've already done my job. 14. He is still cleaning the room. 15. We had three lectures today. 16. They just had a meeting. 17. She has not read this book yet. 18. She is still watching TV.

Open the brackets using Present Perfect or Present Perfect Continues.

1.What's the matter? Why he (to stop)? 2. My cousin (to look) for a job, but he (not to find) a job yet. 3. It (to be) impossible for her to feel at home here. 4. What you (to study) now? 5. They just (to give) you flowers. 6. Sophie is busy. She (to knit) a sweater for her grandson. 7. You only (to have) a piece of cake? You (not to eat) much. 8. People (to plant) carrots and tomatoes now. 9. You (to go) to plant tomatoes this year? 10. Johnny, who finally (to find) a new job, (to give) a big party. 11. How long you (to be) sick? 12. You (to see) any good mov¬ies recently? 13. What you (to look) forward to? 14. Nancy (to look) forward to this weekend. 15. She (to go) to read Shakespeare and she (not to go) to think about work. 16. Mike (to leave) for work yet? 17. They (to pay) their electric bill this month? 18. How long you (to know) each other? 19. Your car (to make) strange noises. Is anything wrong? 20. The boy (to do) his homework and (to take) a karate lesson now. 21. I (to have) dinner with my friends at the moment and I am very happy to see them again. 22. Jay never (to travel) overseas. 23. We always (to have) a dog and a cat. We love pets.

1. has he stopped

2. is looking; hasn't found

3. is

4. are you studying

5. They have just given...

6. is knitting

7. Have you had; don't eat

8. are planting

9. Are you going

10. has foung, is giving (is going to give)

11. have you been

12. Have you seen

13. are you looking

14. is looking forward

15. is going; is not going

16. Has Mike left

17. Have they paid

18. have you known

19. is making/makes

20. has done; is taking

21. am having

22. has never travelled

23. have always had

24. has never owned