Present Perfect vs. Past Simple

1) Sorry, Teddy isn’t here. He (go) to the park.
2) He (not drink) anything because he (not be) thirsty.
3) Teddy (buy) a lot of apples in the market yesterday.
4) Teddy’s parents (not eat) in a restaurant for a long time.
5) A few days ago we (see) an accident near our house.
6) (his friends/arrive) at the party an hour early?
7) I (have) my pet for six months.
8) (Teddy/watch) tv today?
9) Teddy (spend) a few days in Canada last year.
10) She (do) all her homework. Now she can play.​

Hello, (её имя)
How are you? What do you do today? I write this letter for you,because im bored. Today i went school,ate in cafe,meet my friends and do other things. Now i write letter and do my homework. It's hard,but im try. Yesterday i read about your contry,is very interesting. How you study? Good? Do you have a lot of friends or many? I want to tell you about my country.
I live in Russia. I love my country, Russia is awesome. I will answer your questions. Houses in Russia are big,small and middy. Houses are very beautiful,in old city you can see aold buildings,they are very nice. 
Usually,in typical house have 2 or 3 bedrooms. If you have a flat,then you have 1 or 2 bedrooms. I live in flat,and i have 2 bedrooms. One for me and one for my mom and dad. I like my room,i do all then she be comfortable.
My mom call me wash the dishes,sorry,i need to go. 
Write you later,and i wait your answer to my question! 
Bye xx

The ideal student should do the following:
1. To be at school on time
2. To do his homework
3. Not to wear inappropriate clothes, to be tidy and neat
4. To keep the right day schedule
5. Not to wear tattoos or piercing
6. Not to run in the lobby at school
7. Not to fight at school or on its territory
8. To eliminate the damage made
9. To respect teachers and classmates
10. To work hard on improving his knowledge
11. To be diplomatic and modest in every situation
12. Not to make noise at lessons, not to distract himself or others.
13. To look great. The dress code should be classical. E.g. looking at the pictures we can see that a girl has black pants and a white blouse, or a black dress with white dots. A boy has a black suit and a white shirt, or jeans with a white shirt and a dark blue jacket