1.When you read this novel,you'd better make a mark _____ yo

1.When you read this novel,you'd better make a mark _____ you don'y understand.
A.the place where
B.at which
C.where
D.at where
2.Do you know the reason ______ she was late this morning?
A.that B.why C.where D.when
3.This is the teacher ______ we have learned a lot.
A.from who B.to whom C.for who D.from whom
4.I took my friend to the Great Wall,_____ we had some photos taken.
A.where B.which C.that D./
5.He is the only one of the three _____ got the first prize in the speech conteset.
A.who have B.whom have C.who has D.whose had
6.The hard-working students and their happy life _____ we saw in Hangzhou No.2 Middle School made a good impression on us.
A.whom B.who C./ D.which
7.I'll never forget the happiest days in my life _____ I spent in Paris.
A.when B.which C.what D./