Here there are five pages that are going to help you:

• Merrian-webster- In my opinion it is the best english dictionary online.[M-w]
• Reading plus- is a page to improve your spead and comprehension when you are reading. [Reading plus]
• Thesaurus- if you are looking for synomyms or antonyms, this is the best page. [Thesaurus ]
• TED- If you want to practice your listening, this is a good page to do it. [ TED ]
• Vocab zise- brings you a simple tool to measure your students’ vocabulary size.[VS ]