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Use the nouns in the right form (singular or plural):
(1) The population of New York City is more than eight million (people).
(2) Chicago with a (population) of more than three and a half million is
the second largest (city) in the US.
(3) Chicago deals in wheat and other (grain).
(4) Other big (city) are Huston, New Orleans, Los Angeles.
(5) Huston is an oil refining and NASA space research (centre).
(6) By the way, (Englishman) spell the name of the city as Houston.
(7) Its (population) is about 1,213,000 (people).