тут вроде и так со смыслом поставлены предложения , не знаю как делать 2 упражнение . Заранее большое

1. In chemistry class studied various substances and their interactions.

2. Chemistry is divided into 2 General parts - organic and inorganic.

3. Organic chemistry studies fats, proteins, and carbohydrates.

4. Biochemistry — the science of the chemical composition of living cells and organisms, as well as the underlying chemical processes. 

5. Dmitry Mendeleev Russian scientist who created the periodic table of elements.

6. the properties of chemical elements depend on the atomic number.

7. A chemical reaction is the interaction of two or more substances.

8. It depends on the physical state of body: solid body, liquid and gas.

1. I prefer to travel by horse and by train
2. I'm very scared to use cars and aeroplanes
3. In my country average lifespan is about 70 years
4. I can't do a lot to help smb
5. I'd love to live in the countryside
6. to be full of huge blocks of flats. 
7. I want to be far apart from each other. 
8. It's take a long span of time to communicate by writing to each other.
9. I don't like to communicate by telephone.
10. I don't want it to be a very major change in my life. 
11. this invention will take place one hundred years in the future