Hóa trị của nguyên tố nitơ trong các hợp chất NH3 và NO2 lần lượt là A: I và II. B: II và III. C: III và II. D: III và IV.

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IX. Write sentence suing the comparative of the adjectives. 1. I / thin / my brother. I am thinner than my brother. 2. A lake / small / a sea. .............................................................................................................. 3. This book / good / that one. .............................................................................................................. 4. The weather here / hot / the weather in my hometown. .............................................................................................................. 5. A mouse / small / a cat. .............................................................................................................. 6. The sun / big / the moon. .............................................................................................................. 7. A radio / cheap / a television. .............................................................................................................. 8. French food / good / English food. .............................................................................................................. 9. Your hair / long / my hair. .............................................................................................................. 10. A mountain / high / a hill. .............................................................................................................. 11. A child / young / a man. ..............................................................................................................