According to_____WHO, all big cities need health care plans to prevent_____spread of AIDS.
Mr Wang isn’t here , I think he __________ Shanghai .
--- Lily is ill in hospital .---Really ? I _____ know she was ill .
The task is so hard for e . I don’t know _______________.
Good books help us ___________ a whole new world to me .
There is no air _______ water on the moon .