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     a fire, hotel guests are asked to remain calm.

A. As a result of  B. In the event of  C. By reason of  D. In the time of

     a fire, hotel guests are asked to remain calm.

A. As a result of  B. In the event of  C. By reason of  D. In the time of

     a fire, hotel guests are asked to remain calm.

A. As a result of  B. In the event of  C. By reason of  D. In the time of

     a fire, hotel guests are asked to remain calm.

A. As a result of  B. In the event of  C. By reason of  D. In the time of

     ______a fire, hotel guests are asked to remain calm.

A. As a result of  B. In the event of  C. By reason of  D. In the time of