Complete the following sentences with the correct present perfect forms. 1. Mrs Snow a fantastic cake. (make)
2. Debbie a new bike. (buy)
3. I my little dog yet. (not feed)
4. Sally and Jenny a new CD player. (get)
5. Chris wood for a raft. (not find)
6. The pupils their homework. (not do)
7. Nick can't play football today. He an accident with his bike. (have)
8. Liz her homework yet. (not finish)
9. Julia to school today? (be)
10. What you for lunch today, Mum? (make)
11. Bill his cage, but he the dishes yet. (tidy up, not wash)
12. Sandra a lot of things for her birthday party, but she the cakes yet. (buy, notmake)
1)Building materials are divided into natural (natural) and artificial(Строительные материалы разделяют на природные (естественные) и искусственные)
2)Не смогу сказать.
3)metals are divided into two groups: ferrous and non-ferrous(металлы делятся на две группы: черные и цветные)
4)Ferrous metals are those that contain steel and iron.Non-ferrous metals do not contain steel or iron. This group of metals includes: aluminum and copper, Nickel and lead, zinc and tin, brass and gold, silver and platinum, as well as many others that do not contain iron.(Чёрными называются те металлы, которые содержат сталь и железо.Цветные металлы не содержат стали и железа. К данной группе металлов относятся: алюминий и медь, никель и свинец, цинк и олово, латунь и золото, серебро и платина, а так же многие другие, не содержащие железо.)
1) The properties of building and materials are classified into four groups: physical, mechanical, chemical, technological, etc.
2) Resistance to salt aggression and other chemicals (wood)
An important advantage of natural stone is strength, durability, resistance to environmental influences, frost resistance (stone)
Strength; reliability; versatility; combination with other materials (metal)
3) All metals are divided into two groups: ferrous and non-ferrous
4) Ferrous metals and alloys contain iron, non-ferrous metals do not. Ferrous metals are mild steel, carbon steel, stainless steel, cast iron and wrought iron. ... Since they do not contain iron, non-ferrous metals have a higher resistance to corrosion and rust.
Объяснение: just decided