each sentence has four underlined words or phrase(A,B,C & D).identify the one underlined word or phrase  that must be changed in order for the sentence to be correct :Oyster farming  has been practice in most parts of the world for many years .

choose the word or phrase which best completes the sentence. The children wont go to sleep ____ we have a light on outside their bedroom. Option A: except , Option B: otherwise , Option C: unless, Option D: but, correct answer is: unless

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