I have underlined some problem areas, SereneZ. Please fix them and post your revised paragraph here. 5km tunnel in west Virginia which required by a railway.
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SereneZHe lead workers on a project to creat a 1-1.5km tunnel ",change lead to leaded(past tense),is it correct?Yes, but that is not the correct past tense; please check your dictionary.
SereneZi don't know how to fix....please tell me how to fix others and why they have problems,Nevertheless, I would like you to try first