1.What is more important,I believe, it to ( )the plan you've made already.
A.take out B.act out C.put out D.push out
2.I wonder what will become( ) the child now that his parents are dead.
A.in B.on C.to D.of
3.--You were brave enough to tell what you thought of the boss at the meeting.
--Well,now I really regret ( ) that.
A.to do B.having done C.to have done D.to be doing
4.The number of books stolen from the library( )large.
A.is B.are C.has D.have
5.I ( ) have gone to the cinema with them, but I ( )not finish my homework in time.
A.should;would B.should;could C.could;might D.might;could
注：请给出详细的解答过程，并翻译。thank a lot

BBBAB
1.take out 拿出,取出,去掉,出发,取得,扣除,抵冲,发配
act out 将...付诸行动,实践
put out 发行,驱逐,扑灭
push out把...推出去, (使)突出, 挤(出去), 冲(出去)
2.个人意见:我想知道父母的去世,在孩子身上会有什么影响.既然是降临到某人身上,应该用on吧~
3.regret doing sth =regret having done.后悔做了某事(已经做了)
regret to do sth.遗憾要去做某事(还没做)
4.图书管被偷的书的数目是一个很大的数值.
is的主语是the number,所以用单数.主句是the number is large.没有has的说法.
5.should have done,有责备语气,是说:我本该和他们一起去....但是我没办法完成作业
could表能力问题,would 意思是过去常常.所以选B