A. What is the last meal you cooked for someone else? Tell me about it.

The time that I made some foods for someone else was a long time ago. 

=> The last time that I made / cooked food for someone else was a long time ago. 

=> Corrected : The sentences are corrected grammatically. 

I think it was four to five years ago. ✔

I'm not good at making foods, so I rarely cook for someone else. 

=> I am not good at cooking (food), so I rarely cook for someone else. ​

=> Corrected : The sentences are corrected grammatically.  

Instead, I prefer to eat out and I pay for them. ✔​

 B. Make these sentences into English. 

-이 장소는 정말 환상적이다.

 This place is very fantastic.

=> This place is really fantastic.

=> Your answer is correct but here's another way of saying it. 

-이 수박인 매우 달다.

 This watermelon is very sweet. ✔​

-그 쌍둥이들은 아주 사랑스럽다.

 The twins are very adorable.

=> The twins are so adorable.

=> Your answer is correct but here's another way of saying it.​