B Read the sentences and correct the expressions. 1 They're brothers, but they're very different. In fact, they're like pork and cheese. 2 Mr Brown, the head teacher, is the big chicken at school. 3 Cooking isn't difficult. It's a piece of steak! 4 Matt loves watching TV. He's a couch tomato. I'll tell you my plans, but you mustn't spill the carrots! 5​