Hình thoi có độ dài hai đường chéo là 6cm và 8cm . Tính độ dài đường cao của hình thoi.

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Combine the sentences, using relative pronoun. 11. I have read the book. The book is about David Copperfield. ð ...................................................................................................................................................... 12. John helped me to get a job. His father is the manager of the company. ð ...................................................................................................................................................... 13. The girl was injured in the accident. She is now in hospital. ð ...................................................................................................................................................... 14. Patrick was very annoyed. His name was missed off the list. ð Patrick………………………………………………………………………… Join each pair of sentences using a “preposition + whom/ which’. 15. I’ll give you the address. You should write to it. => ....................................................................................................................................................... 16. The man was standing over there. I was telling about him. => ....................................................................................................................................................... 17. He gave me a lot of advice. Much of them was very useful. => ....................................................................................................................................................... Rewrite the following sentences using relative clauses replaced by participles and to infinitives 18. The last person who leaves the room must turn off the lights. ð .................................................................................................................................................... 19. The books which were written by To Hoai are interesting. ð .................................................................................................................................................... 20. Do you know the boy who broke the window last night? ð ………………………………………………………………………