1.You should be firm___you believe yourself to be correct.
A.in which B.where C.what D.how
2.The hunter thought he should make it a true to leave bullets___he could find them again.
A.where B.there C.when D.in the place
3.___that these boys were too young,they could be excused.
A.Giving B.Suppose C.Considered D.Given
4.I always put my father's picture___I can see it every day,because I missed him a lot.
A.in which B.where C.when D.which
5.MP3 has the advantage over Walkman___it is easy to carry and take up very little space.
A.in which B.of which C.in that D.so that
原因是什么？

1 B
在哪方面坚定（firm），where引导地点状语从句。

2 C
leave sth. in some place，这里in some place的位置用一个从句表示、充当，因此是一个宾语补足语从句，这里看成状语从句也无妨，而且表示地点，所以选where。

3 D
given=considering 考虑到，鉴于

4 C
理由同第2题

5 C
in that=because 因为，引导原因状语从句