–Excuse me, but can you tell me which road I should take to the post office?--______ of the four roads will do.

One of the most important questions they had to consider was _____ of public health. 

  I hope there are enough glasses for each guest to have ______.

— Would you get me a bar of chocolate from the kitchen, dear?—______one?                                        

Doctors should take special care when treating children because their breathing rate is different from _____ of adults.