Which sentence uses a semicolon correctly?

(Remember, a semicolon joins two complete sentences.)

Sometimes she thought these glances were perceived; and even returned.

Often had she seen; or imagined that she had seen this fair creature.

Accused people either opened the door to a tiger or a lady; this was the king's method of justice.

Accused people either opened the door to a tiger or a lady; this was the king's method of justice.