со сослагательным наклонением:
1. I wish it (to be) snowy and frosty the whole winter.
2. If he (not to tell) me about it yesterday, I (not to know) everything.
3. If she (not to miss) lessons last week, she (to know) what to do.
4. I wish they (to meet) again next year.
5. You (to understand) me if I (to tell) you the truth.
6. I wish they (to buy) everything what they need.
7. Mary (to become) a famous actress long ago, if she (to have) such talent.
8. If my brother (to be) in trouble, I (to help) him at once.
9. I wish I (not to see) him in such stupid situation.
10. What they (to do) if they (to be) at our place?
11. If he (to learn) the poem, he (not to have) got a bad mark.
12. I wish she (not to lose) her keys, she couldn’t open her door.
13. If you (to warn) me yesterday, I (to do) the work in time.
14. They (not to buy) the car if their friends (not to lend) them money.
15. We wish you (to see) this concert before.
16. Where they (to go) if they (to have) the chance?
17. I wish he (to be) rather serious.
18. If Mary (not to live) so far, you (to meet) more often?
19. What we (to drink) if we (not to have) coffee?
20. If she returned earlier, she (to be able) to see him before he left.
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