1.   But organic matter from sewage is not the only contributor to an oxygen shortage in waters surrounding a big metropolis like New York.

2.   Since Ota Ward is in the middle of a big metropolis, defunct factories quickly give way to office buildings or shops.

3.   To make sure that he remains in control, Boniol has mapped out a somewhat Spartan regimen for his impending life in the big metropolis.

4.   The downward trend in crime was most pronounced in the big metropolises.