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#2. すっぱい”の”たべもの
すっぱい is い adjective and we do not use の with it

#3. ロマンチックカップル
ロマンチック is a な adjective. ロマンチックなカップル is correct. Many English words, when used as adjectives, they become な adjective.

#5. アルコール”は”のみますか？
I would use を instead of は. You can use は only when you have been talking about other drinks that he can drink, and then ask about alcohol.

#7. ニュージーランド”は”いったことがありますか？
The same as #5, when you were talking about other places that he’s been before, then ask about this, you can use は, but I would use へ instead of は if it’s just one random question.

#9. インドネシアご”は”じょうずです
I would use が instead of は. If you use は, the same as #5 and 7, you are comparing the languages with another language. It gives me a sense that he’s not good at other languages, or he cannot speak any other languages.

However, thank you so much for making this website. It’s super helpful.

Nice content, I love it

Arigatou gozaimasu