помогите пожалуста ребята:)

1)must
2)need to
3)have to
4)should
(вариантов может быть несколько)

When Edison was a boy of fifteen,he worked as a telegraph operator.He had to be on duty froom 7 p.m to 7 a.m and give a signal every hour to prove that he did not sleep.The signals were made with astonishing exactness. One night an inspector arrived and saw Edison sleeping in a chair. He was about to shake him when he caught sight of a mechanism on a table near clock pointed to the hour the instrument got busy and one lever threw open the key while the other sent the signal ever the wire.The inspecter seized the sleeping boy,roused him and fired him.That is why the first of Edison's numerous invention was never patented ...этот текст мне нужно написать по русскому как он читается.Например(Hello-хэллоу)вот так весь текст мне надо помогите пожалусто а то тему здать надо.А в англ яз я не сильна:((((