---How can I keep healthy?---I think you ought to_________.A.do more exerciseB. doing more exerciseC. exercising more
–I was riding along the street and all of a sudden, a car cut in and knocked me down.-- You can never be ________ careful in the street.
______Jim ______his cousin has been to America,but of them know the country well.
Suzy is well __________. She keeps all her things in good order.
Yesterday, Jack was asked to make _______ speech in ______ front of the classroom to report what he did during the National Day.
Could you tell me _______ a concert in Nanjing next week?