As you may have read in page 25 in your textbooks, in order to sound "English", not only pronunciation is important, but also intonation. The best way to achieve this is practicing by listening lots of English conversations, no matter if they are American or British English, Autralian or Irish. Here you are some links for you to practice at the same time you will have the opportunity to try some of the Internet audio sites suggested on the left corner of this blog.
http://www.trainyouraccent.com./ (some tips to sound "more American")
http://www.ezslang.com/ (with some sections dealing with tourism)
http://www.gazzaro.it/accents/files/accents2.html (different kind of accents)
http://members.multimania.co.uk/mdmorrissey/phonlinks.htm (some links on English dialects and accents)
http://www.bbc.co.uk/voices/yourvoice/feature2_4.shtml (a very good but not very updated resource on different kinds of British accents)
http://www.wikihow.com/Speak-in-a-British-Accent (How to sound British)
After having a look at all of this, comment here you experience. Have you learned anything new on intonation? Did you know about the importance of having a good intonation?
Now, remember, listen and learn as much as you can...(You can listen to some English radio station while reading this blog. Look at your right)