Remember to give me a call ______ youarrive in Beijing.

The number of articles published on smoking _______ amazing, but a great number of people _______ still smoking.[ ]

It’s required that the students__ mobile phones in their school, so seldom _ them using one.

The old man enjoyed the fresh air and admired the beautiful surroundings.________, he lived a happy life.[ ]

ch salt did you put in the soup–I’m sorry to say, ________ I forget