Which letter-cluster will replace the question mark (?) to complete the given series?

HSDA, IZQT, ?, KNQF, LUDY

Select the option that represents the correct order of the given words as they would appear in an English dictionary.
 1. Beginner
 2. Beheld
 3. Beggar
 4. Belief
 5. Behind

Select the option that is related to the third word in the same way as the second word is related to the first word. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.)
 Bee: Beehive :: Dog: ?

A number has been denoted to each of the given letters. Select the option from the following four possible arrangements of these numbers that forms a meaningful word.
 E = 1, N = 2, T = 3, S = 4, T = 5, D = 6, U = 7

A + B means ‘A is the father of B’
 A – B means ‘A is the mother of B’
 A % B means ‘A is the brother of B’
 A & B means ‘A is the son of B’
 If A + B & C – D + E, then how is A related to E?

Which letter-cluster will replace the question mark (?) to complete the given series?

ABCD, FVJV, KPQN, PJXF, ?

Which letter-cluster will replace the question mark (?) to complete the given series?

RLV, PNS, NPP, ?, JTJ

Arrange the following words according to dictionary arrangement. 

1. Rank   

2. Rain  

3. Rare    

4. Rackle