A. What food is your favorite?

My favorite foods are ramen and spaghetti. 

​(Capitalization)

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B. Wow It's good.

=> Another way: Your sentence is okay and this is another way of saying it.​

Wow, it's sunny. 

Let's go to the park.✔

​

I want to go. But I have soccer contest tomorrow.

=> Another way: Your sentence is okay and this is another way of saying it.​

I hope we can, but we have a soccer game tomorrow.​