Three sentences are given. You need to find if they are grammatically correct or incorrect and mark the answer accordingly.

(P) Next day I stepped into the chief jeweller’s to set it by the exact time, and the head of the establishment took it out of my hand and proceeded to set it for me.

(Q) Within a weak it sickened to a raging fever and its pulse went up to a hundred and fifty in the shade.

(R) At the end of two months, it had left all the timepieces of the town far in the rear and was a fraction over thirteen days ahead of the almanac.