1. Complete the sentences and use a comparative form.
1) This coffee is very weak. I like it a bit (strong).
2) The room in the hotel was really big. I expected it to be (small)___.
3) The weather is too hot in this city. I’d like to live somewhere (cold).
4) Your work isn’t very good. I know you can do (good).
5) My home task is a bit boring sometimes. I’d like to do something (interesting)___.
2. Complete the sentences and use a superlative form.
1) This is coffee I have ever tried! (strong)
2) It is the church in my city. (old)
3) She is one of tennis players in the world. (good)
4) Everest is mountain. (high)
5) Russia is country in the world. (big)
3. Use have to/don’t have to/needn’t
1) He keep the room tidy.
2) You buy tomatoes, we have lots of them.
3) The car park is free here, so you pay for it.
4) You speak louder, I can hear quite well.
5) We have got plenty of time, so we hurry.
6) They wear a school uniform on Fridays, but they usually do.
4. Read the dialogue between Mr. Cox and Daniel at p. 80, SB and agree or disagree with the statements.
1) Daniel thinks the room is awful.
2) Daniel mustn’t make noise.
3) Daniel doesn’t have to keep the room tidy – there is a maid who does it.
4) Daniel can’t invite his friends to his room.
5) He can have snacks and soft drinks in his room.
5. Read the text about The Empire State Building(p.81) and choose the correct answer.
1. The Empire State Building
a. is the tallest building in the world.
b. is the tallest building in New York.
2. It took….. to complete.
a. 410 days
b. 420 days
3)At the Empire State Building most visitors go straight to the
a. Laboratory.
b. Observatory.
4)The building can be white, green, blue, purple, red and orange
a. depending on the day of the week.
b. depending on the occasion.
the Hiking club is the most interesting for me because it helps me see how beautiful our world is
the Skiing club is the most interesting for me because it helps me keep fit
the Fight club is the most interesting for me because it teaches me to move quickly
the Dance club is the most interesting for me because it teaches me to dance
the Music club is the most interesting for me because it helps me understand music
the Book club is the most interesting for me because it helps me learn more about different writers and their works '
the Travellers club is the most interesting for me because it helps me learn more about different countries
the Science club is the most interesting for me because it opens the secret of nature to me
the Horse Riding club is the most interesting for me because it teaches me to take care of animals
Объяснение:
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: