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Complete the museum curator's dramatic speech about the cursed "Eye of the Kraken" diamond.
"Welcome, everyone! This magnificent diamond _________________________ in 1842 by a very unlucky pirate. Today, because of its mysterious curse, it _________________________ behind six inches of bulletproof glass for everyone's safety."
The correct answers are was discovered and is kept.
"Was discovered" is the past simple passive. We use it because the action happened at a specific time in the past (1842), and the diamond received the action (it didn't discover anything itself).
"Is kept" is the present simple passive. We use it because this is a general fact or current state ("Today"), and the diamond is receiving the action of being kept.