---Mr. Black, I find  ______  difficult to play the piano well.---Oh, I think you just need to practice more  
#35100
A
it
B
it is
C
this
D
that
推荐题目
______are good friends.  
#35141
A
I and Jack
B
Jack and I
C
Jack and me
D
Me and Jack
_____can work out the problems because _____of the problems is easy.
#35006
A
None;no one
B
None;each
C
No one;none
D
Each;every