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Please, check this text. This is my homework for english lesson and I don't know if it is correct or not...

When the classroom door opened, everybody went silent. It was our last Friday's lesson - Maths. All of us are thinking about weekend but before we must to do a test. It was sunny and hot outside. After hard week not all were prepered for test. Our teacher slowly entered the classroom and sat at desk. He started takeing the register. Only two students were absent, whole the rest was present. Teacher closed register while we were prepareing for hell.
- "Test will proceed next week" - teacher said. - "I forgot prepare questions for you".
Suddenly quiet class started screaming.
- "Silent ! - Before I will change sentence" - teacher warned. Everybody went silent again.
- "Now you are free, and you can go home. I wish you good weekend".
- "Thank you and goodbye" - answer the students and fast leave the classroom.
Comments  
When the classroom door opened, everybody went silent. It was our last lesson on Friday: Math. All of us are thinking about the weekend but before we can go, we must take a test. It was sunny and hot outside. After a hard week we were not all prepered for the test. Our teacher slowly entered the classroom and sat at his desk. He started taking roll. Only two students were absent, all of the rest were present. Teacher closed the roll while we were preparing for hell.
"The test will proceed next week," the teacher said, "I forgot to prepare questions for you".
Suddenly the quiet class started screaming.
"Silence! Before I change my mind." The teacher warned. Everybody went silent again.
"Now you are free, and you can go home. I wish you a good weekend".
"Thank you and goodbye." Answer the students as they quickly leave the classroom.

- "Silent ! - Before I will change sentence" : I'm not sure the intention here, my best guess is included above.

Roll/Register. American would use the word "roll", I'm not sure if Register is used in other dialects.
when the classroom opened everybody went silent. It was the following normal day but to time.
In that day a young policeman came to our class. He explained that the police organised an exercise and he ordered to go to our big and modern gym. when our class entered to gymnasium we saw a lot of people from our school. Then we sat down on the floor and started to talk. The policeman left us.
After several minutes seven men came in gym. They had guns. We were shocked and frightened. everyone tried to calm down others. We did not know what was going on. Then the policeman entered to the gym again. He took our principal and ordered him to call to the president. At that time I realized that they were terrorists. I thought they demand ransom. I did not mistaken. They demound from president one milion zloty for us. If he had not paid, they would killed everybody. When I heard that I was really frightened.
I throught that I'd never see my family, my friends. It was terrible. I wanted to run away.
But suddenly I saw a real police who entered to our gym and started to shoot to offenders.
Fortunately they kept the cryminals and students surrived. I was so happy that I still alive.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Hello, Anon! Do you want us to correct your text, or ?
Another mistake - Use a single tense through out the sentence. The whole story is in past tense and one sentence "we are thinking..." (or something like that) is in present tense!

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Uh oh... I was a bit late... Sorry!
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please correcy my text. thanks
this text is good or bad?
hi:)i have housework and i don't know it is good or bad. please correct it.

Dear Kate,
I hope you are well. I'm sorry it has taken so long to write back to you, but I haven't got much time.
I writing to you, because I want to tell you about talk. It started at 8 p.m. on Saturday to my school. The subject this meeting was:"Why heathy food is important for our organizm?".
the organiser was the doctor Hellena Smith. She gave us many interesting advice, for example:we must follow a sensible diet, avoid stress, cut down on fatty food and regular training.
I must eat food which has got many carbohydrates, fibre and protein, among other things: cheese, skimmed milk, yougurts, wgolemeal bread, rise, radish ad fruits.
This informations are very important for me, because I have lose weight. I use some hints. Everyday I will jogging and conduct healthy live style.
Anyway, I have to finish now.
Give my regards to your parents.
Best wishes
Monika

Thanks:)
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