If you want to practice your English pronunciation skills, you need to listen to words and sounds closely so that you can understand those little differences between similarly sounding words. You can do this by listening to the radio, speaking with native speakers, or listening to pronunciation tapes.
Here you will find links to several pronunciation lessons that you can listen to and read along with in order to properly pronounce your English words.
Lesson 2: www.blabbinit.com/content/podcast-5-pronunciation-2-stuff-staff-hair-her-cut-caught
Lesson 3: www.blabbinit.com/content/podcast-9-pronunciation-boss-bus-truck-track-cold-called
Lesson 4: www.blabbinit.com/content/podcast-20-pronunciation-cold-called-word-world-got-gut