Underline the controlling idea in the following sentence.Giving up smoking is not so easy for some heavy smokers.
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Underline the controlling idea in the following sentence.As a medium of exchange, money also acts as a common measure of value.
Underline the controlling idea in the following sentence.For years pollution has been a big problem in industrialized countries.
Underline the controlling idea in the following sentence.There are several reasons why a sick person should stay at home rather than in hospital.
Underline the controlling idea in the following sentence.During the process of civilization, however, traveling has added more meanings to human life.