Practice:  I practiced play the piano, yesterday.
              I practice played the sports basketball, yesterday. (basketball).
Blue: My pencilcase The color of my pencil case  color is blue. 
   The sky is blue. (Your sentence is correct. However, you have to capitalize the first letter of the sentence. Also, don't forget to put period  in your sentences.
Hulauf: I like hulauf. (Your sentence is correct but it is not "hulauf" it is "Hula-Hoop"

You are doing great, Angela! Thank you for doing your homework! Happy Thursday!