correct mistakes

Choose and correct the underlined word or phrase in each sentence that needs correcting

1 Weather and geography conditions may determine the type of transportation used in a region.
A B C D
2, When you talk to the old man, please remember to speak out as he's hard of hearing.
A B C D
3, The old and the new in transportation also contrast sharply in Middle East.
A B C D
4, The ocean probably distinguishes the earth from other planets of the solar system, for scientists
A B C
believe that large bodies of water are not existing on the other planets.
D

I dont' know how to do this excercise

1 Weather and geography geographic/al conditions may determine the type of transportation used in a region.
A B C D
2, When you talk to the old man, please remember to speak out up as he's hard of hearing.
A B C D
3, The old and the new in transportation also contrast sharply in the Middle East.
A B C D
4, The ocean probably distinguishes the earth from other planets of the solar system, for scientists
A B C
believe that large bodies of water are not existing do not exist on the other planets.
D

but I think
(1) type ---> types
"geograpy condition" is ok