— _______ is it to your hometown from here?— Well, it takes over two hours by train.
--- Lily is ill in hospital .---Really ? I _____ know she was ill .
The task is so hard fore . I don’t know _______________.
Good books help us ___________ a whole new world to me .
There is no air _______ water on the moon .
They don’t know what ___________ the problem .