Gap-fill exercise - take care - make sure you choose the right word (with an apostrophe or not!) to fit in the gaps!
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!