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Use Present Perfect or Past Simple.
1. Where ... you ... (find) the key? 2 . He ... (be) in Africa last year. 3.He ... already ... (see) the film. 4.I ... (see) him this week. 5.They ... never ... (meet) this man.

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valera253
valera253
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Tbiahat - habitat cnextit - extinct ggearba - garbage rleecycd - recycled edollupt - polluted ronenmevint - enviornment 1) scientists say that one species of plant, animal or insect becomes extinct every day. 2) a lot of trash can be recycled. 3) what can we do to protect the enviornment? 4) every person produces about 650 tons of garbage during their lifetime. 5) the explosion polluted the town with dioxin.1) you may not use your mobile phone during the lesson, so will you switch it off, please! 2) can you hold your breath for more than a minute! 3) you should take your umbrella with you today. 4) he is terribly fat. he should not eat too much. 5) you mustn't make any noise here.2. b) greenhouse effect. 3. b) air pollution.4. a) poison. 5. b) ecology.

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