KEVIN:I went to a museum and I saw a many things. and I saw very big Gyeongcheonsa pagoda it's very good.

CORRECT: I went to a museum and I saw many things such as the  Gyeongcheonsa pagoda it's very good and big.

KEVIN:I like gold crown it is a wonderful.

CORRECT: I like the gold crown it is wonderful.

KEVIN:I want to see this crown again. - CORRECT

KEVIN:it's good museum I like this museum I will go again.

CORRECT: It's a good museum, I like it and I will go there again.

Hi, Kevin^^. I'm so happy that every time a give you homework you do it right away. I also observe that you're getting better when it comes to constructing sentence, just continue the good performance. I'm proud of you!