put in must or must not, should or should not 1. you...be so selfish 2. i don't think you...smoke so much 3. you.... exercise more 4. i think you....try to speak to her 5. you are overweight. you....go on a diet 6. there....be something wrong what the fridge! it ia making a very unusual norse 7. this book.....belong to the library it's certaniy not mine 8. where's Lucy? she.... be at the library as she oftem goes there at this time 9. i.....eat too much cete or i'll get fot 10. we....be late for the exam​