All of us find ________ necessary to take exercise every day. 
#55752
A
this
B
that.
C
them.
D
it
推荐题目
–Is ____ your family photo?--Yes,_____ are my parents. 
#55833
A
this; this
B
these; this
C
this; these
D
that; that
–Are these your rulers? – Yes, ________.
#55827
A
these are
B
it is
C
they are
D
they aren’t
_____a cat.  We do not know_____ name.      
#55860
A
It is, its
B
Its, it is
C
It is, It is
D
It is, is