I think         necessary to do some running in the morning.
#54859
A
it
B
that
C
this
D
one
推荐题目
–Are they ______books? --No, they aren't. They're ______ books. 
#52967
A
you; they
B
your; he
C
your; her
D
your; she
Here are some potatoes, please ________.
#52754
A
cut it up
B
cut them up
C
cut up it
D
cut up them
—How did your uncle learn to play the guitar?—By ________.
#54567
A
myself
B
yourself
C
herself
D
himself
Derek is a polite boy. Everybody in our class ________ him.
#38409
A
like
B
likes
C
liked
D
will like