1，when and where to build the new factory____yet.
A.is not desided B.are not disided C.has not disided D.have not disided
2,A grop of___are eating___and at the foot of the hill.
A.sheep;grass;leaves B.sheeps;grasses;leaves C.sheep;grass;leaf
D.sheeps;grass;leafs
3,you are ____you think you are!
A.not half as clever as B.not half as clever as C.as not half clever as D.as not half clever as
4,This kind of fish____oil,which is good for people who have heart trouble.
A.is rich in B.is rich with C.is rich at D.rich in
5,She insisted that she___at the meeting.
A.was present B.present C.be present D.is present
6,Organic farming also___crop growing with natural with natural rather than chemical fertilizers.
A.refers to B.refer on C.refers with D.refer at
7,---you have made another mistake. ----I'm sorry,but I____.
A.didn't intend to B.didn't intend C.didn't intend for D.don't intend
请简单的解释每一道题，谢谢！！

1c yet表示这句话为现在完成时，故用c
2a sheep，grass复数形式为原型，leaf复数 leaves
3a 翻译成：你可不想自己想象的那么聪明。
4a 翻译成：这种鱼富含一种鱼油，这种油对心脏病人有益。
5c 虚拟语气，她坚决要求要出席会议。
6a
7a