1.Yuan Longping,one of the greatest scientists in China,.as"

1.Yuan Longping,one of the greatest scientists in China,.as"father of hybrid rice"
A is regarded
B has regarded
C regards 为什么选A?
2.I wonder .we can do that thing
A what
B that 为什么选A?
3.Edison made a lot of inventions,.of great importance
A which I think are
B which I think they are
C which I think they 为什么选A?
4.I will talk about a newly—opened market .you may get all .you need
A which that
B where that 为什么选B?
5.Can you lend me the nolve .the other day?
A which you talked with
B you talked about 为什么选B?