mg wie an right D. No, thanks VI. Choose the word(s) CLOSEST in meaning to the underlined word(s) 21. We will join in activities to improve our self-care skills. A. take in B. take part in C. interested in 22. What has been the most challenging experience in your life as a doctor, Mr. Tuan? A. difficult B. easy C. lucky VII. Choose the word(s) OPPOSITE in meaning to the underlined word(s) 23. Dinosaurs died out more than 60 million years ago. B. no longer existed C. decreased A. no longer developed 24. Unluckily, our flight was cancelled, and we had to spend one night at the airport. A. Dangerously B. Fortunately C. Seriously D. participate at D. dangerous D. existed D. Unfortunately