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　　Newton was a great English scientist．He was one of the greatest 1 ndline　 in history．In the morning he 2 ndline　 up early and began 3 ndline　 on one difficult problem．It was 4 ndline　 to have breakfast．5 ndline　 he was thinking 6 ndline　 the problem． Mary brought a pan of water and an egg to his room． She was going to boil the egg 7 ndline　 him．But Newton wanted to 8 ndline　 by himself．He 9 ndline　 to Mary，“Please put the egg 10 ndline　 the table．I'll boil it．”

　　Mary put the egg 11 ndline　 Newton's watch on the table and said，“Boil the egg for only four minutes and it'll be 12 ndline　．”Then quickly she walked out of the room．Mary 13 ndline　 Newton would forget to boil the egg．She went to his room again half an hour later．What did she 14 ndline　 ? Newton was standing by the pan. having the 15 ndline　 in his hand．He had put the watch in the pan and was boiling it．

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