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Add commas where necessary. Change the relative pronoun to "that" if possible.
1. This is a photo of my hometown which lies along the coast
2. A river which is polluted is not safe for swimming.
3. The mekong river which flows through the south of the country is a great source of seafood.
1. This is a photo of my hometown which lies along the coast
2. A river which is polluted is not safe for swimming.
3. The mekong river which flows through the south of the country is a great source of seafood.