Ordering of Sentences - Verbal and Reasoning

Directions to SolveIn questions below, each passage consist of six sentences. The first and sixth sentence are given in the begining. The middle four sentences in each have been removed and jumbled up. These are labelled as P, Q, R and S. Find out the proper order for the four sentences.
Q1:

S1: The dictionary is the best friend of you task.
P : That may not be possible always.
Q : It is wise to look it up immediately.
R : Then it must be firmly written on the memory and traced at the first opportunity.
S : Never allow a strange word to pass unchallenged.
S6: soon you will realize that this is an exciting task.
The Proper sequence should be:

A PQRS

B SPQR

C QRPS

D SQPR

ANS:D - SQPR

No answer description is available.