—Excuse me．what’s this for？
—It’s a cleaner and it________to pick up dirt．
| A．uses |
| B．is used |
| C．is using |
| D．used |
It will be difficult ________ a robot_________ same things as a person,
A. of, to do B. for, to do C. for, doing
Their life will be__________ if there are ____________children in a family.
A. richer; less B. poorer; fewer C. richer; fewer
He always helps__________ the housework.
A. with B. for C. in
Robots can do manyjobs, because they will never get___________.
A. boring. Boring B. bored, boring C. boring, bored
-What do you think the weather_________ tomorrow?
A. will be B. will like C. will be like