Fill in the gaps with the correct auxiliary verbs.
Why ____ you eat only vegetables? - I'm a vegetarian. ____ you come to college by bike this morning? -- No, I walked. What ____ you doing when I phoned? - I was sleeping. ____ you going to the stadium? -- No, I'm going shopping. ____ she work as a nurse? -- No, she works as a doctor. ____ you got a temperature? - Yes, I have. ____ you like a glass of orange juice? - Yes, please. ____ your father a world-famous athlete? -- No, his twin brotter was. ___ you swim? -- No, I'm afraid of water. ___ you explain how to use the weight-lifting machine? - Certainly.