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13. Clara: Good luck with your coming chess tournament. Oscar: Thank you very much. 14. Lily: You should take part in the environmental campaign. It's a great way to help our planet. Noah: Sounds interesting! Tell me more. 15. Mia: I think you should switch to a reusable bottle. It's better for the environment. Liam: That's a great idea! I'll get one soon. Here are the correct forms of the words in the brackets: 1. The discovery of oil brought many benefits to the town. (discover -> discovery) 2. The invention of electronic devices has made communication much easier. (invent -> invention) 3. English, with its numerous varieties like British, American, and Australian, is widely spoken as an international language. (various -> varieties) 4. His advice was really valuable in helping me decide on my future career. (value -> valuable) 5. The teacher asked Susan whether she wanted to visit Eiffel Tower. (want -> wanted) 6. The teacher wondered if students understood the importance of preserving endangered species. (understand -> understood) 7. Katie wanted to know if her team would come home for lunch. (will come -> would come) 8. David asked his father whether he would help him with his project the next day. (will help -> would help) Here are the rewritten sentences using the given words in brackets: 1. Peter asked me if Amanda and her family wanted to travel to Ha Long Bay. 2. The engineer told us that they would install more wind turbines next year. 3. Kevin was the person who got on the bus, carrying a big cat in the box. 4. This is the scientist who discovered a new way to recycle plastic. 5. The market, which sells fresh products and local crafts, is a great place to explore. 6. My laptop, which I bought last month, is not working. Here are the corrected sentences with the mistakes identified: 1. Elena asks Sheila if she is excited about her upcoming trip to Hong Kong. (Mistake: 'was' -> 'is' for future plans, and added 'to' instead of 't') 2. She said that she would buy a new electronic dictionary the next day. (Mistake: 'will' -> 'would' for reported speech in the past tense)