A book called a "thesaurus" gives writers inspirations about synonyms they can use in their writing when they want to avoid repeating a word unnecessarily.

If you are looking to replace words, as Randy said, use a thesaurus: http://www.thesaurus.com/ I also agree with Dan. It is not a big problem. Time is the most important ingredient in expanding your vocabulary... as long as what you are saying is clear and makes sense, you should just be patient and wait for more English words to mean something to you so that you can use them in your every day conversation.

Thank you Kevin. I always try looking for this way. I visit websites and search newspapers written with in English which gives me a new vocabulary.

I have an additional suggestion: you should read newspapers written in English. The writers of newspapers intentionally will repeat ideas within the stories but use different words to express these same ideas. Not only will you expand your vocabulary this way, but you will have the opportunity to see in what context the word is used.

If nobody has complained or criticized, I would not worry too much about it. Just try to be as clear as possible. Avoiding repeated words is a matter of style. Clarity first, style later! Think about it later as your writing ability improves and your vocabulary expands. Sometimes repeating a word can add strength and force. In Martin Luther King's famous speech, "I Have a Dream" he simply keeps saying "I have a dream" over and over again. He doesn't say "dream" in one sentence and "vision" in the next. Of course, that's an oration, not a report.