Use the right prepositions or adverbs: every morning ten o'clock, when her lecture jean the room, where i was work. her careful, accurate work was of great me. she prepared slides which it was necessary to examine. she was very careful and never made a mistake. her presence stimulated me o'clock we had the the seventh day, as we worked silently i heard a step and professor challis stood doorway "i thought i'd look in, robert, to see how you were getting on. i rose at once and introduced jean. he bowed in his old-fashioned manner i understood that he liked her. .that he came regularly to visit us, the lunch hour he sat chair watching us with his bright eyes. he often told his life as a young student sorbonne, where he worked under the great duclaux. (from "shannon's way" by a. cronin)

Every morning regularly at.. ten o'clock, when her lecture was over. Jean came into... the room, where I was already doing work. Her careful, accurate work was of great help.to.. me. She prepared hundreds..of. slides which it was necessary to examine. She was very careful and never made a mistake. Her presence stimulated me greatly.  At one o'clock we had lunch...in the laboratory... On the seventh day, as we worked silently I heard a step and turned..round. Professor Challis stood ..in .the doorway "I thought I'd look in, Robert, to see how you were getting on. I rose at once and introduced him..to. Jean. He bowed .to..her in his old-fashioned manner I understood that he liked her. .Because of .that he came regularly to visit us, often. at.. the lunch hour He sat .on .a chair watching us with his bright eyes. He often told us..about. his life as a young student .in..Paris .at .the Sorbonne, where he worked under the great Duclaux.