Read and answer the questions

Once upon a time there was a man. One day he met two friends on the street. He invited(邀请) them to his apartment on the fortieth floor. The elevator(电梯) didn't work and they had to climb upstairs. When they arrived at the fortieth floor, he put his hand into the pocket and looked for the key to the door. It wasn't there. Then he remembered where it was. It was in his car downstairs!

(1)Which floor did the man live?

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(2)Why did they climb the stairs?

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(3)Where was the key?

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Where did you _____?