The problem the world has been paying attention is why

The problem the world has been paying attention is why
1.The problem the world has been paying attention is why the earth is becoming warmer in recent years
A.for which B.to which C.with that D.to whose
2.The wonderful museum where is a special exhibition today has been built up by wokers in a short time
A.hardworking B.world-famous C.lazy D.kind-hearted
3.We have looked into the case carefully,and the only explanation is that the instruction books( )
A.were making up B.were coming up C.were mixed up D.were lifted up
4.The method you suggested，othes measures,has been tried,but the machine still doesn't work.
A.thanks no
B.be along
C.along with
D.get together