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_________ happened to be no one in the building when the fire broke out.

A. It                    B. There                 C. This                   D.That

_________ happened to be no one in the building when the fire broke out.

A. It                  B. There               C. This                 D.That

       happened to be no one in the building when the fire broke out.

A. It                              B. There                C. This                       D. That

        happened to be no one in the building when the fire broke out.

  A. It          B. There         C. This          D. That

       happened to be no one in the building when the fire broke out.

  A. It          B. There         C. This          D. That