Fill in the blanks with preposition. the great french physicist, ampere, was an absent-mind­ed man. one day he was waiting his friend. the appointed hour arrived, passed and his friend did not come. as ampere had to go he took a piece chalk and wrote his door: "i have gone . i shall return two hours." and he went away. he returned two hours later. while he was going upstairs he worked out a very difficult problem. "if my friend had come the appointed hour," he said himself, "i should have told him this problem. i shall speak him it now. perhaps he will be able to solve it." so when he came his own door and saw the words written it, ampere decided that he was his friend's door. "oh," said he, "he has i am very sorry! were he home, we should discuss my problem." and he wrote the following words: "very sorry that i have not found you home." then he went downstairs again.

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