19. People speak English all over the world _____________________________________________________________________________ 20. Thomas Edison invented the phonograph in 1877 _____________________________________________________________________________ 21.Children don’t clean their bedrooms every day _____________________________________________________________________________ 22. Mary eats a loaf of bread every morning _____________________________________________________________________________ 23. A short circuit could cause the fire. _____________________________________________________________________________ 24. I could send this mail to her on time. _____________________________________________________________________________ 25. Should they announce that news as soon as possible? _____________________________________________________________________________ 26. Phuong has to return the scientific books to the library _____________________________________________________________________________ 27. Will the government rebuild the memorial monument? _____________________________________________________________________________ 28. The teacher won’t accept paper written in pencils. _____________________________________________________________________________ 29. The principle might interview her. _____________________________________________________________________________ 30. What computer can I use to type this letter? _____________________________________________________________________________