If you want to be fit, you ... not eat cakes, but you certainly ... walk a lot. 2. I'm late. I ... hurry. 3. There is light in the house, somebody ... be in. 4. The bus we took didn't go up the hill and we ... walk. 5. Every child ... know traffic rules. 6. It's dark outside, it ... be about 8 now. 7. You ... not eat so many sweets because they contain a lot of calories. 8. You ... not speak to your mother like this. 9. Why ... I do somebody else's work? 10. I think you ... give up smoking.