7. Underline the right word 1) Fred is older / the oldest than his sister. 2) You must / mustn't use any notes. We have a test and I want to check your knowledge. 3) If you really want to try the best spaghetti in the world, you need to go to the restaurant / fast food in the centre of the city. 4) Who is more famous / the most famous actor in the world. - I can't tell, all of them are great. 5) You have to / don't have to walk the dog, I can do it. 6) You must / mustn't step on the grass. It's forbidden!