A.   what winter activity do you like best? why?

i like ski. It's so funny. --> I like skiing. It's so fun.

=> Corrected: The sentence is corrected grammatically. 

B. 

big!     --> How big!

Wow! How many flowers are there? 

=> Corrected: The sentence is corrected grammatically.​   

There are 14 of them. (Correct)​