I don‘t know how much I spend （ ）all kinds of books every year.｛buyWhat do you think （ ）the most important event in the world last years?｛beThis year alone,I （ ）more than fifty English compositions,but none of them （ ）successful

I don‘t know how much I spend （ ）all kinds of books every year.｛buyWhat do you think （ ）the most important event in the world last years?｛beThis year alone,I （ ）more than fifty English compositions,but none of them （ ）successful
I don‘t know how much I spend （ ）all kinds of books every year.｛buy
What do you think （ ）the most important event in the world last years?｛be
This year alone,I （ ）more than fifty English compositions,but none of them （ ）successfully .｛write write
用所给词的适当形式填空

I don‘t know how much I spend （ ）all kinds of books every year.｛buyWhat do you think （ ）the most important event in the world last years?｛beThis year alone,I （ ）more than fifty English compositions,but none of them （ ）successful
本来没分有人答的问题我是不高兴答的,不过我觉得上面三位的答案都稍微有点问题,所以写一下我认为的答案,望高人指点一下是否正确.
1,in buying 理由：speng on sth/ in doing sth
2,was ,理由：这里单三毫无疑问,而时态我觉得“do you think ”是个干扰,去掉看就明显是过去时.
3,have written ,was written 理由：“this year along” 明显是和现在有关的过去,用现在完成； 后半句主语“none of them”先判断为单数,然后them指代的书肯定是被写,最后,从前半句中得知这些书已经被写,所以是过去时.
现在初三的英语就已经这么.我国真是培养人才的地方

I don‘t know how much I spend （ in buying ）all kinds of books every year.｛buy
What do you think （ is ）the most important event in the world last years？｛be
This year alone，I （have written）more ...

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I don‘t know how much I spend （ in buying ）all kinds of books every year.｛buy
What do you think （ is ）the most important event in the world last years？｛be
This year alone，I （have written）more than fifty English compositions， but none of them （ was written）successfully . ｛write write
第三题，有个时间状语This year alone 来提示你需要用完成时态，第二空是被动语态。

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I don‘t know how much I spend （ buying ）all kinds of books every year.｛buy
What do you think （was ）the most important event in the world last years？｛be
This year alone，I （have ...

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I don‘t know how much I spend （ buying ）all kinds of books every year.｛buy
What do you think （was ）the most important event in the world last years？｛be
This year alone，I （have written ）more than fifty English compositions， but none of them （ is written ）successfully . ｛write write
用所给词的适当形式填空
第1题 spend .......doing
第2题宾语从句，what 主语，last year 过去式
第3题有个时间状语This year alone 来提示你需要用完成时态，第二空是被动语态

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1.buying
2. was
3.have written
4.was written

I don‘t know how much I spend （ in buying in可省略 ）all kinds of books every year.｛buy
What do you think （ is ）the most important event in the world last years？｛be
This year alone，I...

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I don‘t know how much I spend （ in buying in可省略 ）all kinds of books every year.｛buy
What do you think （ is ）the most important event in the world last years？｛be
This year alone，I （ wrote ）more than fifty English compositions， but none of them （ writes ）successfully . ｛write write

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