(2013·重庆，23)It's not easy to change habits，________ with awareness and self－control，it is possible.
#30482
A
for
B
or
C
but
D
so
推荐题目
The first decade in the 21st century is the one ______ many significant advances are made in China.
#33572
A
that
B
in which
C
which
D
where
_______ didn't attend the lecture yesterday won't be given full marks.
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A
Any one
B
Whoever
C
Who
D
The person
Here is a survey about hopes and dreams ______ thousands of students took part.
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A
at which
B
in which
C
with which
D
about which