---What is that? Is it an English learning machine?---Yes. It ________ us to improve our English.A. is used for helping B. used to help C. used to helping
---Why didn’t you go shopping with me two hours ago?---Because my mother________ me outside.
Not only Jim but also his parents ______ a few places of interest since they came to China.
This robot is supposed to save a lot of labor, but it remains a problem if it ______.
—Sam, come downstairs, please. I need your help. —Sorry,mum. I on the phone..
—When and where to spend the holiday ____ yet.—Let’s make it now.