1.Many a student_____that mistake before.A.has made B.have made C.is making D.are making
2.More than one answer_____to the question.A.have been given B.has been given C.were given D.had given
3.All the cattle_____over there at that time.A.is
B.are C.was D.were
4.Half of the students_____to attent the meeting
to be held by the league.A.is B.are C.has been
D.will be
5.Large quantities of food_____wasted.A.were B.was
C.has D.have
麻烦说详细点，谢谢

1.Many a student_____that mistake before.A.has made
Many a 修饰可数名词单数，表Many，谓语用单数。Before是完成时的标志。
2.More than one answer_____to the question.A.have been given
有more than 不用单数，根据句意，用现在完成时。
3.All the cattle_____over there at that time. D.were
All the cattle，用单数形式表复数。at that time用过去时。
4.Half of the students_____to attent the meeting
to be held by the league.B.are
be to的行式表将来。
5.Large quantities of food_____wasted.B.was
food不表种类时不可数，用被动语态。