5. The student don't know how to do exercise which were given by the teacher yesterday. 6. The diagrams which were made by young Faraday were sent to Sir Humphry Davy at the end of 1812. 7. The gentleman who lives next door to me is a well-known orator. 8. All the astronauts who are orbiting the earth in space capsules are weightless. 9. All students don't hand in their papers will fail in the exam.
