Exercise 7. Read the following sign or notice and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions 
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DOGS MUST BE CARRIED ON ESCALATOR

A. If you want, you can ride the escalator with your dog.
B. You don’t have to carry your dog on the escalator.
C. When using the escalator, you should carry your dog in your arms.
D. If you have a dog, you can’t use the escalator.