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Teacher: I say, Paul. What is there on the table?
Paul: There is a 1_______ there.
Teacher: What is it called, Paul?
Paul: To my mind, it is called a 2_______.
Teacher: Yes, right you are. And what is a manometer?
Paul: I believe it’s an instrument for 3_______ pressure, isn’t it?
Teacher: Yes, that’s right. Look, it has a 4_______ and a pointer.
Paul: Well, I see.