, очень важно, буду за это благодарна!) Раскройте скобки, употребляя требующуюся форму инфинитива.
1. They seemed (to quarrel): I could hear angry voices from behind the door. 2. They are supposed (to work) at the problem for the last two months. 3. The only sound (to hear) was the snoring of grand¬father in the bedroom. 4. Her ring was believed (to lose) until she happened (to find) it during the gen¬eral cleaning. It turned out (to drop) between the sofa and the wall. 5. They seemed (to wait) for ages. 6. I hate (to bother) you, but the students are still waiting (to give) books for their work. 7. He seized every opportunity (to appear) in public: he was so anxious (to talk) about. 8. Is there anything else (to tell) her? I believe she deserves (to know) the state of her sick brother. 9. He began writing books not because he wanted (to earn) a living. He wanted (to read) and not (to forget). 10.1 consider myself lucky (to be) to that famous exhibition and (to see) so many wonderful paintings. 11. He seems (to know) French very well: he is said (to spend) his youth in Paris. 12. The enemy army was reported (to overthrow) the defence lines and (to advance) towards the suburbs of the city. 13. The woman pretended (to read) and (not to hear) the bell. 14. You seem (to look) for trou¬ble. 15. It seemed (to snow) heavily since early morn¬ing: the ground was covered with a deep layer of snow.
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