介绍:
Mum: Oh, John, look, the lift doesn't work.
Dad: We have to walk upstairs.
Mum: My bag is heavy.
Dad: Give it to me. My bag is light.
Mum: Here we are at last, the 7th floor.
Dad: I am tired. I can't find my key to the door.
Mum: Here, try this key.
Dad: It doesn't work. We have to wait for the children to come home.
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