17. I (hear) the story before , so I (not find) it very interesting. 18. After she (try on) all the dresses in the shop, she bought the most expensive one. 19. They (not have) breakfast when I (get) up. 20. The children(be)very excited because they(not see)a tiger before. 21. Most people (leave) before the volcano (erupt).22. By the time we (arrive) at the canyon, it (stop) snowing
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Sinh Học lớp 12
