Use the correct form of "to be":

1. Where ...you going? --I aw going to the supermarket. 2. I ...thinking about the dress I saw in the shop window yesterday. 3. We ...going to be late. The shop will be closed. 4. ..you going to the baker's? Buy a loaf of bread for me, please. 5. We ...driving too fast and didn't see the traffic lights. 6. He ...choosing an umbrella too long but didn't buy any. 7. While my mother ...paying for the things I bought a bar of chocolate for myself. 8, I hope it ...not ...raining tomorrow. It's our shopping day. 9. He ...celebrating his birthday tomorrow. Let's go and buy him some present. 10. What ...you looking for? --I ...trying to find a Christmas present for my wife.