（2014年山东日照市高三校际联合检测）l.We can never expect____bluer sky unless we create_____less polluted world．
#7615
A
a；a
B
a；the
C
the；a
D
the；the
推荐题目
One way to understand thousands of new words in gain _____good knowledge of basic word formation.
#10431
A
/
B
the
C
a
D
one
We don’t think the experiment is _______ failure. At least we have gained _______ experience for future success.
#8406
A
the; a
B
a; an
C
a; /
D
/; the
After ______ series of unsuccessful attempts, he has finally passed ____ driving test.
#8303
A
the , the
B
a, the
C
the , a
D
/ , a