---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
______ wake up your sister, Ben. She needs a good sleep.
Practice more, ________ you’ll do better in playing chess.
Children _______ sit in the front seat of a car. It’s too dangerous.
In Chongqing, you can often see many people dance outside together if it ______ in the evening.
Mr. Green’s office is _______ the 26th floor. You can take the lift there.