— I know smoking is bad for my health, ____ I just can’t give it up.— It is easier said than done.
-------I am going to London for a holiday next month. ------______.
-------Jim, help ____ to some bread. -------Thank you.
I like junk food very much, but I eat ______ only once a month.
---- How often does the train run to Beijing ? ----- ________ twenty minutes.
I didn’t go to the beach______ vacation. I stayed ______ home.