.
Реакциями обмена и замещения соответственно являются

  1) Zn + HCl à и CH4 + Cl2à         2) HCOOH +CaOà  и  C6H6 + HNO3à

  3) CH3COOH
+ Naà и C2H4+ H2à    4) HCOOH + NaOHà  и  C2H4+ O2à

 2. In some homes the atmosphere is quite formal. In others, it is informal and you may sit at the kitchen table to eat dinner. Informality is a way of taking you into the warmth of the family circle. It is always customary to sit at dinner table as we do in Russia. When you are at the party you may be walking from one sitting-room to another, talking to the guests with a glass of wine in your hand. Food is served in one of the rooms and you can help yourself to whatever and whenever you like.Переведите пожалуйста,без помощи переводчиков типа гугл или яндекс и им подобным