It will be difficult for a robot       the same as humans.
#48768
A
do
B
to do
C
doing
D
does
推荐题目
— I feel tired and sleepy.  — Why not stop _______?
#50035
A
to work
B
having a rest
C
to have a rest
D
to go on with your work
The problem is         difficult for me        work out.
#51005
A
very; to
B
enough; to
C
so; that
D
too; to
There are so many kinds of MP3 in the shop. We can’t decide  ______.
#49042
A
what to buy
B
to buy what
C
which to buy
D
to buy which