1. This boy reminds me of an acquaintance of mine, I`ve known him since my childhood. (this is ok but it isn't clear who they've known since childhood) 

2. Mr Brown wanted to know if my elder brother resembled me. I explained to him that he resembled me very much in appearance, but didn`t resemble me in character at all.
3. George wanted me to call Tom as soon as possible and to remind him to write to (his? My?) parents. I didn't feel like doing that, because I was sure that people shouldn`t be reminded to do that kind of thing. 
4. I know that although he`s committed a few crimes, each time he has got away with them.
5. Miss Rice was a born secretary. Besides, her boss was always fond of listening to her amusing stories, which brought him great pleasure.
6. – What do you take interest in? – My areas of interest are religion, history and philosophy.
7. Michael told us that from his point of view, the fact that teachers should not accept presents from students was unfair.
8. After this famous detective had retired, he decided to investigate yet a few more crimes.
9. That day Jane seemed very displeased. Her little sister was in the habit of scattering stuff all over the house, and Jane had to clean it up all day long.
10. He explained to us that Boris had always behaved badly with his relatives. We could not approve of such behavior.
11. Before retiring for good, Poirot decided to investigate a few more crimes.
12. He took the case of the missing Pekinese dog reluctantly because it seemed too easy. 
13. Poirot made inquiries and learned that the maid had the habit of chatting to someone in the park whilst walking the dog.
14. At his age he will have to retire soon. It`s inevitable.

Translation

1. This boy reminds me of an acquaintance of mine, I`ve known him since my childhood.
2. Mr Brown wanted to know, if my elder brother resembled me. I explained to him, that he resembled me very much in appearance, but didn`t resemble me in character at all.
3. George wanted me to call Tom as soon as possible and remind him to write the parents. I didn`t feel like doing that, because I was sure, that people shouldn`t be reminded to do things of that kind.
4. I know, that though he`s committed few crimes, each time he got away with them.
5. Miss Rice was a born secretary. Besides, her boss was has always been fond of listening to her amusing stories, which brought him great pleasure.
6. – What do you take interest in? – My areas of interests are religion, history and philosophy.
7. Michael told us, that, from his point of view, teacher should not accept presents from students, that was unfair from him.
8. After this famous detective had retired, he still decided to investigate yet a few more crimes.
9. That day Jane seemed very unpleased. Her little sister was in the habit of scattering stuff all over the house, and Jane had to clean the house all day long.
10. He explained to us, that Boris had always behaved badly with his relatives. We could not approve of such behavior.
11. Before retiring for good, Poirot decided to investigate a few more crimes.
12. He took the case of the missing Pekinese dog reluctantly, because it seemed to him too easy.
13. Poirot made inquiries and learned, that the maid was in the habit of chatting with someone in the park while walking the dog.
14. At his age he will have to retire soon. It`s inevitable.