At the Chemists
Step one: Listening and repeating the phrases
Step two: Practicing English phrases with the dialogue. Once you know how to pronounce the phrases, you can mute the video and practise.
Step three: Doing the following exercise:
At the Chemist's Store
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!