Directions: In each of the following questions, one phrase has been given and it has been followed by four sentences. You have to find out in which of these sentences the phrase has been used properly according to its meaning and mark your answer from the options. Mark your answer 'All correct' if you find that phrase has been applied properly in all the sentences.

NOSE TO THE GRINDSTONE

I. Carla was so determined to get into the college of her choice that she kept her nose to the grindstone all year.
II. Intellectuals often keep their nose to the grindstone at amusement parks and such.
III. When he discovered he wasn't on the invitation list that really kept her nose to the grindstone.
IV. It's not easy to become friends with Sophie; she tends to keep her nose to the grindstone.