We can never expect         bluer sky unless we create         less polluted world.
#10522
A
a; a
B
a; the
C
the; a
D
the; the
推荐题目
The manager has _____ difficulty in finding a man to take _______place of the secretary
#8312
A
a; the
B
the; 不填
C
不填;不填
D
不填;the
What date is it?   _____.
#10352
A
first of May
B
May first
C
May the first
D
B and C