More and more people find ______ necessary to protect our earth. 
#55750
A
it
B
that
C
this
D
its
推荐题目
—Where is Beijing?—        here.
#55888
A
It is
B
He is
C
She is
D
They are
 Are ________ her parents?
#55861
A
this
B
these
C
she
D
that
If you don’t know how to use the word, you should _________ in a dictionary.
#55810
A
look up it
B
look it up
C
look them up
D
look up them