Exercise 3

Gap-fill exercise

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!


Most machines have a system. The most type is called "Safe ". If you this system it is both simply and relatively to refil it. There is no need to the machine the has been used.