四道英语选择题,不要只给答案.

四道英语选择题,不要只给答案.
@#$%^&* Please give me the answer and why?@#$%^&*
1.The Internet has brought ___ big changes in the way we work.
A.about B.out C.back D.up
2.I am sorry it's ___ my power to make a final decision on the project.
A.over B.above C.off D.beyond
3.The home improvements have taken what little there is ___ my spare time.
A.from B.in C.of D.at
4.It is quite ___ me why such things have been allowed to happen.
A.for B.behind C.against D.beyond