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问题: 英语选择题,please!

1.According to our usual practice, __________ is to be effected for 100% of the invoice value.
A. allowance
B. profit
C. budget
D. insurance
2.So far a three-fourths majority in the neighborhood __________ to help the handicapped.
A. have volunteered
B. have been volunteered
C. has volunteered
D. has been volunteered
第一题请翻译一下,第二题请讲解一下语法要点。不甚感激!

解答:

第一个后半句不太清楚
第二个:
1.因为有so far(到目前为止),所以用现在完成时;
2.a three-fourths majority强调的是其中的个体(这些人都去帮助残疾人),而不是强调整体,所以看作复数概念
3.这些人是实施帮助的主体,是动作的发出者,所以用主动语态
选A