A. What breed of dog do you want to have?

I want to have a Pomeranian. ​(Spelling/Capitalization)

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B. We will go to watch movie.

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

We're going to see a movie. 

Wow, Harry Potter?​

(Capitalization)

​(Punctuation)

That is my favorite movie.​✔

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