Bài tập yêu cầu viết lại câu sử dụng mệnh đề quan hệ (relative clause). Dưới đây là đáp án hoàn chỉnh:

1. The man who is sitting next to me is a doctor.
2. The envelope which lies on the table has no stamp on it.
3. Benzene, which was discovered by Faraday, became the starting point in the manufacture of many dyes, perfumes, and explosives.
4. My grandmother, who is old and sick, never goes out of the house.
5. The students don’t know how to do the exercises 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 who don’t hand in their papers will fail in the exam.