A hundred years(1).(pass) sins the First World War(2) . (begin), and this year it will be remembered...

To complete the sentences, we need to use the correct verb tenses, taking into account the context provided. Here's a detailed explanation along with the correct forms:

1. A hundred years have passed since the First World War began, and this year it will be remembered in many different ways.

   • "Have passed" is used because we are referring to a duration of time from the past to the present, making the present perfect tense appropriate.
   • "Began" is in the simple past tense because we are referring to a specific point in the past when the war started.

2. It seems that during the past year hundreds of historians have written books which explain how it started, whose fault it was and how we still feel its effects today.

   • "Have written" is in the present perfect tense because it describes an action that has been completed recently and is relevant to the present.
   • "Started" is in the simple past tense because it refers to a specific event in the past.
   • "Still feel" uses the present simple tense because it describes a current state or condition.

3. No way before that one had changed the map of Europe so much: new nations were created and many old ones got back their independence.

   • "Had changed" is in the past perfect tense because it describes an action that was completed before another action in the past (the war).
   • "Were created" is in the passive voice and past simple tense, as it describes events that occurred as a result of the war.
   • "Got" is in the simple past tense because it refers to a specific event in the past.

4. But it is the millions who were killed all over the world that we remember on Armistice Day.

   • "Were killed" is in the passive voice and past simple tense, as it highlights the victims of the war.

5. Have we learned anything new when we read the latest books and TV programmes about this terrible war? Possibly, but there always seems to be a war happening somewhere.

   • "Have we learned" is in the present perfect tense, used to question whether any new understanding has been gained up to the present moment.

In summary, the selection of tenses is crucial to convey the sequence of events and their relevance to the present. The use of the present perfect, past perfect, simple past, and present simple tenses provides a clear timeline and emphasizes the ongoing impact of historical events.

A hundred years have passed since the First World War began, and this year it will be remembered in many different ways. It seems that during the past year, hundreds of historians have been writing books which explain how it started, whose fault it was, and how we still feel its effects today. Never before has one event changed the map of Europe so much: new nations have been created and many old ones have regained their independence. But it is the millions who were killed all over the world that we remember on Armistice Day. Have we learned anything new when we read the latest books and watch TV programs about this terrible war? Possibly, but there always seems to be a war happening somewhere.