Food and fruit are forbidden in the library, ______ you are allowed to have drinks and sweets with you.
. Don’t have the lights ______ all day long. It is a waste of electricity.
. Either you or the headmaster ______ the prizes to the gifted students.
. The 2010 Shanghai World Expo is well worth ______.
I am interested in traveling. It is ______ but ______.
The windows haven’t cleaned for a long time. They need ______.