Use present continuous to complete the sentences. 1) Ann 2) Не 3) Jane and Sam 4) Dad 5) Не 6) Olga 7) We 8) He always 9) 10) Tom usually 11) Listen! Sandy 12) My mother 13) My sister never 14) Sarah sometimes 15) We rarely 16) They often 17) Look! The boys 18) His cousin 19) I ＿ 20) Cats (go) to school now. (play) the guitar every day. (read) a book now. ＿ (wash) his car at the moment. (walk) his dog in the evening. ＿ (play) tennis in the yard. ＿ (draw) funny pictures for our friends' birthday parties. ＿ (do) his homework after school. (not do) an English exercise now. (watch) TV in the morning. (clean) the garage. (come) home. ＿ (go) for a walk every day. (chat) online at the moment. (eat) mice. (read) a lot. ＿ (sing) in the bedroom. (make) lunch now. (help) in the kitchen. (read) classics. 21) Look! This child 22) Our dog seldom 23) (not eat) a hamburger. ＿ (lie) on the sofa. (they, send) text messages at the moment? 24) My father 25) 26) We 27) Where 28) What 29) I 30) (not like) shopping. ＿ (not take) the car to work. (you, come) from? ＿ (have) a cup of coffee now. (the man, work) in our garden? (your girlfriend, do) now? ＿ (the boy, swim) in the swimming pool now?
Полиция сделал все, что могла.
"Эти мальчики могут быть хулиганами (нарушителями ) но это не значит, что они украли твой велосипед", - сказал папа.
"Я знаю, что это они украли ", ответил Терри. "Они, должно быть, продали его".
Терри лежал на своей кровати чувствуя себя одиноким и несчастным . Его велосипед пропал и он не сможет ездить на нем до конца этого времени года(лета ) - или уже совсем не сможет . Ему потребовалось больше года, чтобы накопить на велосипед. Что он собирался делать?
Раздался стук. Это была мама:
"Ты расстраиваешь всех, включая себя. Мы все знаем, что это страшный шок для тебя потерять велосипед". Терри не ответил, и его мать ушла.
Plastics are non-metallic, synthetic, carbon-based materials. They can be moulded, shaped, or extruded into flexible sheets, films, or fibres. Plastics are synthetic polymers. Polymers consist of long-chain molecules made of large numbers of identical small molecules (monomers). The chemical nature of a plastic is defined by the monomer (repeating unit) that makes up the chain of the polymer. Polyethene is a polyolefin; its monomer unit is ethene (formerly called ethylene). Other categories are acrylics (such as polymethylmethacrylate), styrenes (such as polystyrene), vinys (such as polyvinyl chloride (PVC)), polyesters, polyurethanes, polyamides (such as nylons), polyethers, acetals, phenolics, cellulosics, and amino resins. The molecules can be either natural — like cellulose, wax, and natural rubber — or synthetic — in polyethene and nylon. In co-polymers, more than one monomer is used.The giant molecules of which polymers consist may be linear, branched, or cross-linked, depending on the plastic. Linear and branched molecules are thermoplastic (soften when heated), whereas cross-linked molecules are thermosetting (harden when heated).Most plastics are synthesized from organic chemicals or from natural gas or coal. Plastics are light-weight compared to metals and are good electrical insulators. The best insulators now are epoxy resins and teflon. Teflon or polytetrafluoroethene (PTFE) was first made in 1938 and was produced commercially in 1950.Plastics can be classified into several broad types.1. Thermoplastics soften on heating, then harden again when cooled. Thermoplastic molecules are also coiled and because of this they are flexible and easily stretched.Typical example of thermoplastics is polystyrene. Polystyrene resins are characterized by high resistance to chemical and mechanical stresses at low temperatures and by very low absorption of water. These properties make the polystyrenes especially suitable for radio-frequency insulation and for parts used at low temperatures in refrigerators and in airplanes. PET (polyethene terephthalate) is a transparent thermoplastic used for soft-drinks bottles. Thermoplastics are also viscoelastic, that is, they flow (creep) under stress. Examples are polythene, polystyrene andPVC.2. Thermosetting plastics (thermosets) do not soften when heated, and with strong heating they decompose. In most thermosets final cross-linking, which fixes the molecules, takes place after the plastic has already been formed.Thermosetting plastics have a higher density than thermoplastics. They are less flexible, more difficult to stretch, and are less subjected to creep. Examples of thermosetting plastics include urea-formaldehyde or polyurethane and epoxy resins, most polyesters, and phenolic polymers such as phenol-formaldehyde resin.3. Elastomers are similar to thermoplastics but have sufficient cross-linking between molecules to prevent stretching and creep.
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