__ is really hard __ them to climb Mount Tai. 
#69186
A
This, to
B
It, to
C
This, for
D
It, for
推荐题目
— Did you go to Nancy's birthday party last night? —Yes. I did.
#70986
A
So did Tim
B
So Tim did
C
Tim did so
D
Tim went so
 They will never forget the film they saw last Sunday, __________ ?
#69238
A
do they
B
will they
C
don’t they
D
won’t they
---He’s already back to Australia,___________?---________, he is on a visit to Shanghai. 
#69874
A
isn’t he; No
B
hasn’t he; Yes
C
isn’t he; Yes
D
hasn’t he; No
English is very useful ,____it?
#68527
A
doesn’t
B
isn’t
C
can’t
D
won’t
Let’s go and have a rest,      we?
#69538
A
do
B
shall
C
haven’t
D
will