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Decide whether these sentences need a comma. Select the correct answers.
Although it can be inconvenient [COMMA HERE OR NOT?] recycling is important.CorrectIncorrect
Some people choose to migrate to another country [COMMA HERE OR NOT?] because opportunities are better.CorrectIncorrect
The smoking ban in public places has proven successful [COMMA HERE OR NOT?] even though there was public opposition at first.CorrectIncorrect
Many governments are promoting the use of public transport [COMMA HERE OR NOT?] so that the number of private vehicles on the road are reduced.CorrectIncorrect