Add commas as needed in the sentences below. If the sentence is correct as it is, write C on the line ._____ He left the scene of the accident and tried to forget that it had happened.
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_____ Oil which is lighter than water rises to the surface.
_____ Nice is a word with many meanings and some of them are contradictory.
_____ Some people refuse to go to the zoo because of pity for creatures that must live in small cages.
_____ Taxicabs that are dirty are illegal in some cities.