壹、回答：都是that.?第壹句that引導定語從句，定從裏缺賓語需要that充當成分,不用which是因為先行詞作表語要用that。第二句也是that.前後兩個句子主幹完整，不缺主幹成分，需要that充當連詞和such構成結果狀語從句。
二、補充：定語從句中只能用that的情況?
1. 當先行詞是不定代詞時。（everything, anything, nothing all, none, few, little, some等不定代詞時，或當先行詞受every, any, all, some, no, little, few, much等詞修飾時只用that；（something 除外，兩個都可以用，牛津詞典上寫的something既可以後用which,也可以用that,?只不過that更常見，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.當先行詞是不定代詞或被不定代詞修飾時。
如Tell me everything that you know. / All the people that are working are my workmates.
2. 當先行詞是序數詞或被序數詞修飾時。
如 I want the first that looks bigger. / This is the third dictionary that I have used.
3. 當先行詞是最高級或被最高級修飾時。
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. 當先行詞是the only (“唯壹的”)，the very (“恰恰;就”)，the just (“恰恰;就”)，the same (“相同的”)，the last (“最後壹個”)等或被這些詞修飾時。
She is the only person that understands me.
After the big fire, the old car is the only thing that he owns.
5. 當先行詞是數詞時。如 You can catch the four that are dead.
6. 當先行詞作表語時。如 My hometown is no longer the place that it used to be.
7. 當先行詞中既有人，又有物時。The young man and his bike that I saw just now are still there.
8. 當句子中含有兩個定語從句時，如果其中壹個定語從句的引導詞用了which、who、whom，則另壹個定語從句的引導詞用that，以避免重復。
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. 當which、who、whom作疑問詞，引導特殊疑問句時。
如 Which took the camera that was made in Japan? / Who knows the boy that lives upstairs?）