问题描述：
The girl was finally found hidden behind the door,【from where】 she could hear what her parents said.(为什么要用from where ,where前面也可以接介词吗,不是where=in/during which 什么的吗）
We should realize the fact that when you gradulate from university,you are still not prepared for the possible situation 【that 】we may face in the working world.(为什么不用where,不是 case/situation/positon等是where的提示词吗）
Though 【lacking】money ,his parents managed to send him to university.
(A.lacked B.lacking of C.lacked in 为什么用lacking）
I have been working all day,but I feel as if I 【had achieved】 nothing（这里并不是过去的过去吧,为什么要用had啊）
The came for the weekend wearing only some shorts and a T-shirts,【which】is a stupid thing to do in such weather.(为什么不用what)
The place 【that】I visited last summer is just the place【where】I spent my childhood.(我一直不会做这种要选2个,什么时候that 在前 ,什么时候在后啊.这种2个的怎么选啊）
After the adjustment of financial polcies,many netizens put up posts,90 percent【of which】carried the message of approval.(为什么不用who,of whom什么的）
"Ungeilivable"is so new an English word coined on the Internet 【as】is forbidden to aooear in official media or documents at present.(为什么不用which)
In the UK,what impressed me most was the sthdent activity,【where】I got lots of informetion.(为什么不用what或者which）
You must 【have had】 the case where you were taken for your sister.(为什么用have 有加一个had,这叫什么时态啊,什么时候这么用啊）
Mr.Li raied a question 【to which】he then failed to find an answer.(A.for which B.by which C.with which 为什么用to which ,这句话的意思我也读不懂）
有点多,希望越详细越好,我想把它们弄懂,
We should realize the fact that when you gradulate from university,you are still not prepared for the possible situation 【that 】we may face in the working world.(为什么不用where,不是 case/situation/positon等是where的提示词吗）
Though 【lacking】money ,his parents managed to send him to university.
(A.lacked B.lacking of C.lacked in 为什么用lacking）
I have been working all day,but I feel as if I 【had achieved】 nothing（这里并不是过去的过去吧,为什么要用had啊）
The came for the weekend wearing only some shorts and a T-shirts,【which】is a stupid thing to do in such weather.(为什么不用what)
The place 【that】I visited last summer is just the place【where】I spent my childhood.(我一直不会做这种要选2个,什么时候that 在前 ,什么时候在后啊.这种2个的怎么选啊）
After the adjustment of financial polcies,many netizens put up posts,90 percent【of which】carried the message of approval.(为什么不用who,of whom什么的）
"Ungeilivable"is so new an English word coined on the Internet 【as】is forbidden to aooear in official media or documents at present.(为什么不用which)
In the UK,what impressed me most was the sthdent activity,【where】I got lots of informetion.(为什么不用what或者which）
You must 【have had】 the case where you were taken for your sister.(为什么用have 有加一个had,这叫什么时态啊,什么时候这么用啊）
Mr.Li raied a question 【to which】he then failed to find an answer.(A.for which B.by which C.with which 为什么用to which ,这句话的意思我也读不懂）
有点多,希望越详细越好,我想把它们弄懂,
问题解答：
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