Пожалуйста, добрые люди, помогите с английским

1) Read the text, give it a name and make questions to which the sentences after the text can be answers.
Stamp collecting, or philately, has been a hobby of millions of peopl for about 100 years. Stamp collecting can be a very educational hobby Every picture on a stamp was selected for some particular reason. Each can give you some information about the country from which it came. The most valuable stamps, of course, are the rare ones. Usually they are connected with some events. For example, in certain United States post offices in 1847 there was a shortage of five-cent The stamps. postmasters just cut ten-cent stamps in half, each part five cents paying postage. Today these halves cost several hundred dollars each. Mistakes occur in printing stamps, and such mistakes make the stamp even more valuable. In 1918, the first United airmail stamps went States on sale. Each of them cost 24 cents. In office the clerk sold a certain post them at the regular price. what he did not notice was that on some of them the airplane was printed upside down. Later, each of those stamps cost $ 2,000!
1. ..-It is also called philately.
2. ..-For about 100 years.
3. ..-It can give you information about the country from which it came.
4. ..-The rare ones.
5. ..-Because in 1847 there was a shortage of five-cent stamps in certain US post offices.
6. ..-Mistakes in printing.
7. ..-Beacause the airplane on them was printed upside down.

2) Five of these sentences have mistakes in perfect tenses. Find the sentences and correct the mistakes.
1. My pen friend writes that he has just come back from London. 2. Last week he wrote to me that he has stayed in London for about a week. 3. We knew that our friends had enjoyed the film. 4. Why didn't you tell me that you and Poul have met before? 5. Look! I had made some coffee for you. 6. - Where is Mum? - She just gone out. 7. Did father tell you that he has bought some tickets to the cinema? 8. I read in the newspaper that the President had left the country. 9. She known that i have told her the truth. 10. Mother says that she had always wanted me to be a doctor.

3) Write the same in English.
1. Я знаю, что английские школьники уже видели центр Москвы и Кремль. 2. Если вы никогда не видели Гайд-парк, сходите туда в воскресенье. 3. Мы поняли, что наши гости уже рассказали школьникам о своей поездке. 4. Мы только что пришли. Мы еще не сняли с себя пальто. 5. Учитель рассказал нам, где он побывал и что видел. 6. Друзья сказали нам, что уже побывали в новом музее. 7. Мы верим, что мир изменился к лучшему (к лучшему) . 8. Когда путешественники нашли маленького мальчика в лесу, они поняли, что он долго прожил в полном одиночестве. 9. Когда мы прочитали книгу М. Твена, мы ре пили посмотреть пьесу, поставленную по ней (спектакль после него) . 10. После того как Джон написал портрет Люси, он понял, что осуществил свою мечту.