1. A. to be discovered
2. C. to clear
3. A. apologize
4. C. to watch
5. D. to go
6. B. to buy
7. A. waiting
8. A. bullying
9. B. fighting
10. B. to notice

Giải thích:
1. "Son Doong Cave is the largest cave in Phong Nha-Ke Bang National Park" - sử dụng cấu trúc bị động "to be discovered."
2. "Tina was happy to clear the examination cut-off" - sử dụng cấu trúc "to clear."
3. "We made him apologize. He was so rude!" - sử dụng động từ nguyên thể "apologize" sau động từ "made."
4. "They were at the cinema to watch a comedy film" - sử dụng cấu trúc "to watch."
5. "He'd rather go out tonight. Why not go to the café Royal?" - sử dụng cấu trúc "to go."
6. "Please, remember to buy some vegetables and fruits from the market" - sử dụng cấu trúc "to buy."
7. "We're tired of waiting for the bus" - sử dụng cấu trúc "waiting."
8. "You should stop bullying your younger sister" - sử dụng động từ nguyên thể "bullying."
9. "There was nothing for him to fight for" - sử dụng cấu trúc "to fight for."
10. "The first thing to notice when you enter the city is the big, wooden church" - sử dụng cấu trúc "to notice."