1、The place at which the bridge is supposed to be built should be where the cross-river traffic is the heaviest. (定语从句还原就是：The bridge is supposed to be built at the place. 这样就可以判断引导词需要介词at。也可以看先行词the place前需要介词at进行判断。)
2、I saw a woman running toward me in the dark. Before I could recognize who she was, she had run back in the direction from which she had come.(从句还原就是：She had come from the direction，所以定语从句用from which 引导。)
3、There was a single person in the street to whom she turned for help.(从定语从句的谓语动词turn可构成词组turn to sb. for help就可以判断应该填to whom。)
4、The man about whom I talked just now is from Beijing University.(根据定语从句的谓语动词talk判断后需要of或about，因此此处需要about/of whom)
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