More and more people find ______ necessary to protect our earth. 
#55750
A
it
B
that
C
this
D
its
推荐题目
Is this your father? No, ________. 
#55854
A
it is
B
it isn’t
C
he is
D
he isn’t
— _______ does Tom like math? —Because _____ fun.
#55776
A
Why, it’s
B
When, it
C
Why, It’s
D
When, it
 _______ my book , _______ your book.
#55836
A
This’s; it’s
B
this is; these’re
C
That’s ; this’s
D
This is; that’s