—____ your sister know Lucy? —No, she ____.
— Who will go to the _____ for teeth cleaning with you, Mark?— My father.
If you play sports ______a living, your job will sometimes be very dangerous.A. for B. at C. by
How about to your friends?A. talking B. talk C. to talk
Could you please your bed?A. making B. to make C. make
Kids won’t go to school. They will study _____ home ______computers.A. at, on B. in, on C. at , by