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1. Every morning, regularly ... ten o'clock, when her lecture was ..., Jean came ... the room where I was already ... work.

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2. Her careful, accurate work was of great help ... me. She prepared hundreds ... slides which it was necessary to examine. Her presence stimulated me greatly. Every day ... one o'clock we had lunch ... the laboratory.

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3. Then, ... the seventh day, as we worked silently, I heard a step and turned ... . Professor Challis stood ... the doorway.

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4. I rose ... once and introduced him ... Jean. He bowed ... her in his old- fashioned manner. I understood that he liked her.

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5. And ... that he came regularly to visit us, often ... the lunch hour. He sat ... the chair watching us.

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6. He often told us ... his life as a young student ... Paris, ... the Sorbonne.

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