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Agent 007 is reporting a villain's secret location to headquarters. Select ALL the sentences that correctly describe where the villain is hiding.
The correct answers are Dr. Chaos is currently at the bank., He is hiding in the bank's underground vault., and His getaway helicopter is waiting on the roof.
At is perfect for identifying a building as a point on a map (at the bank).
In is used for enclosed spaces (in the vault, in the basement).
On is used for surfaces (on the roof, on the third floor). Therefore, at the third floor and on the basement are grammatically incorrect!