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เกิดไรขันกังสั้งแวดล้อมyo) (งา แปลว่า ด ทับ What is happening to.the Environment? Rivers mพัยใหม่ A new study shows that 86 per สะพวณขัมแม่น้ำเทพ cent of the world's rivers have been damaged by human activity. The study was Conducted by researchers from a university in Toulouse, France. เคทะน์ They examined data on over 2,500 rivers around the world)but they did not Look at rivers in the polar regions of the Arctic and Antarctica or in deserts.)The scientists looked into changes to biodiversity over the past 200 years. They)discovered that biodiversity in over half of rivers has been seriously damaged by humans. The researchers said there were many reasons for this damage. A big reason is the introduction of new species of fish into rivers. Other reasons include polution, dams, overfishing, farming and ปลก) : อ่างๆ mราะน climate change. The researchers say the worst-hit rivers are in western Europe and North America. This is because these regions have large and rich towns and cities. The เมือที่มาฐานางเบ lead researcher said: "Rivers which have the most economic development around ่"ง them, like the Mississippi River, are the most strongly impacted." The River Thames inj London was one of the worst-affected rivers in the study. The least- impacted rivers are in Africa and Australia. The researcher said: "This is probably due to a slower rate of สูคนที่ 90 191 เสชมา ความ นนา Iณนนยฆาก industrialisation in Africa and low population density around rivers in Australia." He added that rivers in many rich nations are unrecognisable compared with how they were 200 years ago. เลวมาก เลวที่สุด / HgrSe / the Nor s t 3/ be tey / the st ดีมา ก ดที่สด Acknowledgement

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Choose the past simple or the past perfect tense 1) We had already eaten when John.. 2) Last year Juan. (come) home. (pass) all his exams. 3) When I 4) I went to the library, then I 5) I opened my handbag to find that 6) When we (get) to the airport I discovered I had forgotten my passport. (buy) some milk and went home. (forget) my credit card. -I (arrive) at the stetion, the train had already left. 7) We got home to find that someone 8) I opened the fridge to find that someone 9) I had known my husband for three years when we (break) into the house. (eat) all my chocolate. (get) married. 10) Julie was very pleased to see that John (clean) the kitchen. (rain) all summer, so the grass was completely dead. (arrive) at the party, Julie had just left. 11) It 12) When he 13) After arriving home, I realised I (buy) any milk. (rein) while I was out. 14) The laundry was wet - it 15) William felt ill last night because he (eat) too many cakes. 16) Keiko (meet) Willam last September. 17) First I tidied the flat, then L.. (sit) down and had a cup of coffee. (play) the piano when he was a child, but he doesnt play now. 18) John 19) When I opened the curtains the sun was shining and the ground was white. It (snow) during the night. 20) When Julie got home from her holiday, the flat was a mess. John (have) 8 party.

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Present Perfect with just, 3.2 already, (not) yet and Past Simple We use the Present Perfect to talk about actions which happened and finished in the past, but we do not know when exacly or it is not important: T have read many biographies and autobiographies. (It's not important when I did it.) Common time expressions used with the Present Perfect: ever - used in questions: Have you ever been to an art galery? * never - used in negative sentences: My grandparents have never left England. 6 since then: She won The X Factor in 2006. Since then she has sold millions of albums. already and just - used mainly in affirmative sentences: Thave already seen this film. They have just left. * yet - used in negative sentences and questions and always at the end of the sentence: Thaven't seen her yet. Has she written any songs yet? If we want to say when something happened, we use the Past Simple. We also use the Past Simple in questions with when. She won a Grammy in 2009. When did yoน see Blur play live? Complete the sentences with the Present Perfect or Past Simple form of the verbs in brackets. (you/ever/be) to the opera? (go) last month. | 1 A: B: Yes. | (see) Madama Butterfly by Puccini. (write) many crime stories. (write) her latest crime story in 2014. 2 Claire Richards She (ust/upload) some videos. (release) his new 3 Look, Pierre 4 My favourite singer single last week, but | 5 Emily (not hear) it yet. (already/buy) a birthday present for her mum. (you/do) your homework yet? (finish) an hour ago. 6 Aะ B: Yes, I

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