Объясните причины этнического многообразия Поволжья, ПОМОГИТЕ ПЛИИИЗ

Какова основная мысль текста "Люцерн"?

1.In 2010 a terrible earthquake in Haiti ...........(leave) thousands of people homeless.

2.Susan.....................(break) her arm and can not play tennis.

3.We`ll need to leave a bit later because i .....................................(not/finish) packing yet.

4.The thieves ..........................(escape) with the stolen painting long before the police arrived.

5.We ............................................(have) a lot of fun sitting around the campfire songs last night.

6.It was the first time Chris  .............................(ever/trek) in the mountains.