Теория:

Study some necessary moments for the definite article.
  
1. We use the with the phrase: the same.
 
We live in the same street.
  
street-1209401_640.png
Рис. \(1\). Street
 
2. We use the definite article with these words: the sun/ the moon/ the sky/ the sea/ the country/ the world.
  
The sun is shining today.
  
forest-1950402_640.png
Рис. \(2\). The sun  
 
The world is full of different people.
  
3. We use the with: the police, the army, the fire brigade.
 
Let's call the police. The situation is dangerous.
  
squad-car-1209719_640.png
Рис. \(3\). The police
 
4. The definite article is used in these phrases: the top/ the end/ the middle/ the left/ the right/ the bottom.
  
The table is in the middle of the room.
  
5. We say the radio, but television without articles.
 
I listen to the radio a lot.
  
vintage-1216720_640.png
Рис. \(4\). The radio  
 
What's on television tonight?
Источники:
Рис. 1. Street, 2016, https://pixabay.com/images/id-1209401/ Pixabay License CC0 Free for commercial use No attribution required
Рис. 2. The sun, 2017, https://pixabay.com/images/id-1950402/ Pixabay License CC0 Free for commercial use No attribution required
Рис. 3. The police, https://pixabay.com/images/id-1209719/ Pixabay License CC0 Free for commercial use No attribution required
Рис. 4. The radio, 2016, https://pixabay.com/images/id-1216720/ Pixabay License CC0 Free for commercial use No attribution required