定语从句和名词性从句的几道题

请做出详细解答：(解释得好的，我会追加分数）
1.The place(__)the bridge is supposed to be built should be__the cross-river traffic is the heaviest
Awhich,where Bat which,which Cat which, where Dwhich,in which

2.Many workers were organized to clear away__remainedof the World Trade Centre
A.those B that C.what Dwhere

3.the other day,my brother drove his car down the street at __seemed to be more than 150km/ph__I thought was a dangerous speed.
Aas,that Bwhat,which Cwhat,what Dwhich,which
另外，死敌怎么说？用dead的什么形式？

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