Why is perseverance important in achieving long-term

Select the combination of letters that when placed sequentially in the blanks of the given series will complete the series.

14 : 75 : : ?

Select the option in which the pair of letter clusters is related in the same way as the pair of letter clusters given below.

GPU: KTY 

Select the right analogous pair from the given options.

Melt : Liquid :: Freeze : ?

Select the option that is related to the third word in the same way as the second word is related to the first word .

Select the option that is related to the fourth term in the same way as the first term is related to the second term.

World : Nation :: House : (?)

Select the option that is related to the third term in the same way as the second term is related to the first term.

PARENTS : RUMFQBO :: FORESTS : ?