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4 Write statements in the present perfect with for or since. 1. | not done snapchat / last July. 6 Complete Pim's list for her online news show. Use the present perfect or past simple. - Ton hurt his arm this morning. He has ..havent.4one.anapahat.since.lสst.July. 2. People / know / about the Amazon River / (1) meve hurt.า (nอver / hurt) his arm กmany years. betore. (2) John (eat) insects yesterday. He's never eaten insects before, 3. We / not See / our COนsins / 2012. | had a Taekwondo lesson last Tuesday. | (3) (never / do) 4. Americans /watch/ movies/ Taekwondo before. OVer a hundred years Saly (4) (tidy) her bedroom this Wednesday. She didท't tidy her bedroom all year! 5. 1/ not blog / monthร My mother (5) (send) an email yesterday. She haรn't sent 6. Email/ be / around/ the 1990s. one before. Saly's dad went to a movie on Friday. He (6) (never / be) to Vocabulary E) a movie. 5 Write the past participles of these verl Writing See write 7 Write afew sentences about your life. fall make buy hurt find eat Win Send learn have break 04 Present perfect vs. Past simple 11 จาก 11 When we use past simple we Say a tinme in the past whereas we use present perfect to รay an action happened at นทspecied time before now. Unit 4 The Worid of Mwctia |37

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Refer to the table, answer questions 7-9. Table: Some properties of elements at 25C and 1 atm pressure Hardness or Appearance Electricity conductivity Element Melting Boling point (C) toughness point (C) Shiny, silvery liquid Mercury Yes -39 357 Colourless gas Hydrogen No -259 -253 Iron Shiny, silvery solid Hard and tough Yes 1,538 2,861 Sulphur Yellow solid Hard and brittle No 120 445 Sodium Shiny, silvery solid Soft and tough Yes 98 883 Silicon Shiny, silvery solid Hard and brittle Slightly 1,414 3,265 Boron Black Solid Hard and brittle No 2,030 3,900 Chlorine Yellowish green gas No - 102 -35 Bromine Orange red liquid No -7 59 Oxygen Colourless gas No -219 - 183 Magnesium Shiny, silvery solid Hard and tough Yes 650 1,090 lodine Shiny, dark purple Hard and brittle No 113.5 184.5 Solid 7. Which elements are metals and which are non-metals? 8. Is silicon a metal or non-metal or metallloid? Justify your reason. 9. What are the uses of metals, non-metals and metalloids in daily life? Give examples. 0. Blement A is a solid with shiny ธurfaces, good electricity and heat conductivity, the density Or 7.8 g/cm, boiling point of 1,090 C and melting point of 650 C. Is Element A a metal or non-metal? Justify your reasons. 67

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