英语高手请进！！很需要你们的帮助！

英语高手请进！！很需要你们的帮助！
首先在这里先说明一下情况，因为我的错题是考试的历年真题来的。同时这次的考试对我来说很重要，希望各位前辈能够帮助我，谨慎作答，因为我会完全相信你们的答案的！谢谢！（题目比较多，如果越详细，解释越明白。我会最后提高财富值的）谢谢！
虚拟语气
1.The suggestion that the major______theprizes was accepted by everyone.
A.would present B.present C.presents D.ought to present
----à我选择了A,
答案选B
2.We required that the machineparts______cast iron.
A.is made of B.be made from C.be made of D.is made by
-----à我选择了B
答案选择C
3.The business is risky.But______we would be rich.
A.should wesucceed B.we should succeed
C.might wesucceed C.would we succeed
------à我选了B
答案选A
4.I should very much like to go to the party,but_____.
A.I am notinvited B.I have not been invited C.I was not invited D.I will not be invited
-----à我选了C
答案选择B