——There must be a dozen pens in this house but I can never find one when I need one.——Keep looking.          is sure to turn up. 
#17140
A
One
B
It
C
That
D
This
推荐题目
Some say one thing, but ____. 
#16390
A
other, another
B
others, the other
C
others, another
D
the others, others
— Have you heard the latest news?—No, what ______
#16581
A
is it
B
is there
C
are they
D
are those
Out of__________ did the cat come and then it ran across the yard. 
#16195
A
somewhere
B
anywhere
C
everywhere
D
nowhere