__ 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
—What does she look like?—____
#70438
A
She’s a student.
B
She’s twelve.
C
She has long arms.
D
She likes apples.
—Is this room   _____  ?     —Yes, it’s theirs.
#70648
A
Lily and Lucy
B
Lily’s and Lucy’s
C
Lily’s and Lucy
D
Lily and Lucy’s