Find a proper form of a verb according to the situation: 1. My parents always (give, gave) me good advice in my process of education.
2. I (make, made) my decision to enter the Pedagogical Institute long before finishing school.
3. Many students (take, took) an active part in the students' scientific conference every year.
4. My group-mates and I (make, have made) summaries and extracts in all subjects we specialize in.
5. Next year my friend (choose, will choose) a pre-school faculty because she likes to work with little children.
6. I'll (do, did) my best to become a highly qualified specialist in my own sphere.
7. This year our dean (is lecturing, lectured) on Pedagogics.
8. I already (registered, have registered) in the library.
9. In some months we (have, will have) our first pedagogical practice.
10. The students must (attend, are attending) all seminars and lectures if they have no good excuses.
11. We (are having, have, had) our English lesson at this moment.
12. I just (finished, have finished) doing this exercise.

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.

Объяснение:

Анна, можешь рассказать о своей семье? Ну у меня семья совсем маленькая. У меня нет братьев и сестер. Моя бабушка живет с нами, значит, в моей семье четыре человека.

Вы живете в доме или в квартире? Мы живем в большой квартире в районе центра города. Мне нравится здесь.

Твои родители работают? Да, они оба работают. Они учителя. Мне повезло, потому что моя бабушка присматривает за мной, когда они на работе. Я часто ей по дому, а днем мы вместе ходим по магазинам.

Каково это быть ребенком в России? Нам, как и большинству детей, очень весело, но зима немного меняет нашу жизнь. Становится очень холодно, поэтому мы не можем играть на улице. Когда идет снег, я катаюсь на лыжах и коньках. Маленькие дети тоже лепят снеговиков и устраивают битвы в снежки.

Вы много времени проводите на улице? В теплую погоду мы много времени проводим на улице. По выходным я люблю кататься на велосипеде с друзьями. Еще мне нравятся поездки за город с родителями.