In each of the following questions, the sentence is broken into four parts labelled (P), (Q), (R) and (S). You are required to arrange these parts so as to form a complete meaningful sentence and then choose the correct combination (Qs. ৩৬ - ৪০).
Reading books
P: is a habit
Q: but also enlarges the mind
R: because it not only increases knowledge
S: which must be cultivated by everybody