In a class of five students P, Q, R, S and T, only one student is known to have copied in the exam. The disciplinary committee has investigated the situation and recorded the statements from the students as given below.

Statement of P : R has copied in the exam.

Statement of Q : S has copied in the exam.

Statement of R : P did not copy in this exam.

Statement of S : Only one of us is telling the truth.

Statement of T : R is telling the truth.

The investigating team had authentic information that S never lies. Based on the information given above, the person who has copied in the exam is

The least number of squares that must be added so that the line P-Q becomes the line of symmetry is ______

Nostalgia is to anticipation as _____ is to _____.

Which one of the following options maintains a similar logical relation in the above sentence?

Consider the following sentences :

(i) I woke up from sleep.

(ii) I woked up from sleep

(iii) I was woken up from sleep

(iv) I was wokened up from sleep.

Which of the above sentences are grammatically correct?