1 Two thirds of the crops (has)been damaged by the storm.

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1 Two thirds of the crops (has)been damaged by the storm.
为啥不填have?
2 After the exams(was)the time to relax.
为啥不填is
3 none of the students (have) finished the exam yet.
为啥不填has
4 Another five weeks (is) nessary for us to finish the work.
为啥不填are
5 I ( will tell) them that i think they are making a great mistake.
为啥不填told
6 Although the first part of the book is easy,the rest (has proved difficult)
为啥不填are difficult
7 I should very much like to have gone to that party of theirs,but (i was not invited)
为啥不填i have not been invited
8 We solved the problem by using a computer rather than (did) it all by hand.
为啥不填doing
9 Many years ago,it was believed that the earth was square and (that) a person would fall off its edge.
为啥不能省掉that

1.将三分之二的庄稼看作一个整体.
2.这个应该是时态问题.一般过去时.
3.none作主语的句子谓语动词可单可复,所以可以用has.
4.同1题.
5.根据后面题意,这里应该是一般将来时,所以用will tell.
6.应该是单数,所以不能用are.
7.前面should have done表示应该做但没有做的事情,也就是说过去了,所以后面用过去时,表示没有被邀请.
8.rather than 后面用动词ing形式.
9.并列从句中,第二个关系词不能省略.
你的问题好多,但是我喜欢回答相关问题.

Two thirds of the composition __ been corrected. The house of whose roof was damaged has nao been Two-thirds of the earth __ by water. A ship was damaged during a storm at sea and only two of the 1 The house ______roof was damaged has now been reoaired. The house the windows of which were damaged has now been men The house the windows of which were damaged has now been rep the part of a building left after the rest has been damaged? Two thirds of the work in our office ______ by the computer About two thirds of the Earth's surface is covered by the se The residents___had been damaged by the fire were given help two thirds of the land are covered by water 这句话有何错误