Directions: Rewrite the following sentences to be grammatically correct. Each sentence has four punctuation errors. To make the sentences correct, you may need to add, remove, or change punctuation marks (commas, semi-colons, colons, periods, apostrophes).

1. When over three million gallons of oil were spilled in the oceans near coastal California, over ten thousand dolphins, seals, sea lions, and seabirds were killed.