"You do realize" is almost the same as "Do you realize" except that we are expressing hope or expectation that the person already knows something (that it's a completely insane request) - even though we are not completely sure. The meaning, however, is the same. "You do realize" in this case is also something like a mild scold. It's very good that you pick up on these nuances! :D

Was gibt es Nützliches oder Interessantes im Magazin? - is a question because the sentence begins with "Was" (what). Es gibt was Nützliches oder Interessantes im Magazin. - is a statement and not a question. "Es gibt" means roughly "There is" in English. "Gibt es was Nützliches oder Interessantes im Magazin? - is always question. "Gibt es" is roughly "Is there?" The reason why "Nützliches" and "Interessantes" are capitalized is because in this case they are nouns - but mean exactly what you thought. Nouns in German are always capitalized.

TOEFL test

I would like to write something down to practice English today, but I do not know what I should write about. I have TOEFL test in a few days. In the test we have to deal with four sections: Reading; listening; writing; and speaking. The speaking section has six parts, which are independent tasks or integrated.In the independent tasks, they ask for our opinion on something and we must convey our opinion in forty-five seconds. It is completely different in the integrated parts. Indeed, in the integrated parts we read a passage, afterwards a professor gives a lecture about the passage or two students talk about the reading. Then, we must deliver an response to the question based on both the reading and the conversation. I think it's a big deal.I have five days until I take the TOEFL exam.

Corrected:

I would like to write something down to practice English today, but I do not know what I should write about. I have a TOEFL test in a few days. In this test, we have to deal with four sections: Reading, listening, writing and speaking. The speaking section has six parts which are independent tasks or integrated. In the independent tasks, they ask for our opinion on something and we must convey our opinion in forty-five seconds. It is completely different in the integrated parts. Indeed, in the integrated parts we read a passage and afterwards a professor gives a lecture about the passage or two students talk about the reading. Then, we must deliver a response to the question based on both the reading and the conversation. I think it's a big deal. I have only five days until I take the TOEFL exam.

Very good!   Just a few small mistakes in punctuation and articles.   Good luck on your test! 

- Mark

Learn English

A few years ago I started to learn English. I had a private lessons but I was learning only with my teacher. I never did my homework and never learned at home. So, after a few years I knew English a little bit, I knew a few words, a few sentences... Six months ago I decided to learn English seriously. I am learning every day and I didn't leave any day out... So, I noticed some progress, but I want much more... Two or three weeks ago I found this site. I was excited so I sent 200 messages to people from all over the world and... I got only a few answers. What happened!? A lot of people want to learn Polish, I offer it them and nothing. (In exchange I want to learn English) It doesn't make sense. I don't understand them. I can, I want conversation every day, because only systematic learning will give us some results. A few years ago I tried learning sometimes and my results were poor... So, I know that this letter contains a lot of mistakes, I don't know if somebody (someone-pasuje lepiej) can correct it. If you do, it I will be grateful. Thank you. Mariusz.

Rozumiem co piszesz. Wydaje mi się, że dużo ludzi chce uczę się Polskiego ale tak naprawdę nie robi. :D

sanatorium

Hallo everybody! Yesterday I returned from thesanatorium in Połczyn Zdrój. I was there, because I had a problem with my knees and I needed some treatments. So I went there and after few days I was very pleased. It was great there! I had a few treatments, very pleasant treatments every day. Almost every day I could dance. I also met a lot of great people. There It was fantastic there. Unfortunately, everything comes to an end. What can I say? Today I'm home and everything is normal... I had to leave my new friends and I can't dance anymore. In front of me are a few hard days. Yesterday, I was at the university. I had an exam and I had to give up my project (hand in my project-brzmi lepiej). Now I am preparing materials for school for tomorrow. For In 30 minutes I'm going to go to bed.

New friends

A few weeks ago I registered on Italki. I sent over 150 messages and I got about 15 answers back. I'm glad, because I have a lot of new frends. Now I can practise my English more intensively. Witch several people I write messages to several people and in this way I can practise writing. One very nice woman from Ukraine was talking with me and one young man from England wants to talk with me almost every day. Of course, I will teach him Polish. It will be a very interesting exchange. I would like to learn more and more. I want to have more friends to talk to/with. If one person is absent on Skype then I'd like to talk with another Italki user.

Bardzo dobrze!

Health

I usually try to be a positive person. I try to find meaning in difficult times, but it's hard to keep the motivation up when it comes to health issues. I believe that the best advice you can give someone is to for them to take care of their health and appreciate it while everything is fine. because Once you've lost it, you won't be able to get it back, a least not as easily. I'm aware that this is an ultimate cliché, but the truth is that, really, most people I know don't even think about their health until they fall ill, another cliché. It's a well-known fact that most of us take almost everything for granted just because we are too busy with life - work, relationships, Facebook - but neglecting our health is possibly the worst thing we can do to ourselves.