Вставьте правильный артикль(a/an,the)

Red Square is a city square in the capital of Russia.It is a symbol of Russia and Moscow.It is a central square of all Russia.It is very beautiful. People say that the name Red Square comes from the colour of the bricks or from the link between the colour red and communism.There you can see  Lenin's Mausoleum,  Saint Basil's Cathedral, GUM department store, Kazan Cathedral.There is also a monument on the square.It is a bronze statue of Kuzma Minin and Dmitry Pozharsky.They  helped to clear Moscow from the Polish invaders in 1612, during theTimes of Trouble.On May 9 every year you can see Victory Day parade there.A lot of tourists come to see it. 

1. I am not drinking tea now. I am writing an English exercise.
2. I donot  drink tea in the morning. I usually to drink coffee.
3. Is Your friend  doing his homework now? Yes, he is. He is  learning the dialogue.
4. Does Your friend go to school in the morning? Of course, he does. He  goes to school at 8 o’clock.
5. Look, the child is sleeping. Yes, he always sleeps after dinner.
6. My grandfather doesnot  work. He is on pension.
7. What is your sister  doing now? I want to talk to (поговорить с) her. I think my sister is playing the piano.
8. Where does your father work? He is a doctor. He  works at a hospital.
9. Does Your sister  study at an institute? No, she doesn't .My sister  studies at school.
10. Are Your parents  watching TV now? No, they aren't. Mum is watering the flowers, Dad is cooking.