一、回答：都是that.?第一句that引导定语从句，定从里缺宾语需要that充当成分,不用which是因为先行词作表语要用that。第二句也是that.前后两个句子主干完整，不缺主干成分，需要that充当连词和such构成结果状语从句。
二、补充：定语从句中只能用that的情况?
1. 当先行词是不定代词时。（everything, anything, nothing all, none, few, little, some等不定代词时，或当先行词受every, any, all, some, no, little, few, much等词修饰时只用that；（something 除外，两个都可以用，牛津词典上写的something既可以后用which,也可以用that,?只不过that更常见，更加自然）?。如：
Have you set down everything that Mr Li said?
There seems to be nothing that is impossible to him in the world.当先行词是不定代词或被不定代词修饰时。
如Tell me everything that you know. / All the people that are working are my workmates.
2. 当先行词是序数词或被序数词修饰时。
如 I want the first that looks bigger. / This is the third dictionary that I have used.
3. 当先行词是最高级或被最高级修饰时。
如 Tom is the best that I have ever taught. / The most important thing that she can do is to go to bed at once.
4. 当先行词是the only (“唯一的”)，the very (“恰恰;就”)，the just (“恰恰;就”)，the same (“相同的”)，the last (“最后一个”)等或被这些词修饰时。
She is the only person that understands me.
After the big fire, the old car is the only thing that he owns.
5. 当先行词是数词时。如 You can catch the four that are dead.
6. 当先行词作表语时。如 My hometown is no longer the place that it used to be.
7. 当先行词中既有人，又有物时。The young man and his bike that I saw just now are still there.
8. 当句子中含有两个定语从句时，如果其中一个定语从句的引导词用了which、who、whom，则另一个定语从句的引导词用that，以避免重复。
如 The TV set which I bought from the shop that opened last month was broken. / The man who is standing behind the people that are playing cards is my uncle.
9. 当which、who、whom作疑问词，引导特殊疑问句时。
如 Which took the camera that was made in Japan? / Who knows the boy that lives upstairs?）