As a volunteer of the 2012 London Olympic Games, which sign will you prepare to remind people to keep the environment clean?
The doctor says that you will end up in hospital _________ you go on smoking like that.
Could you tell me _________ find another interesting detective story to read?
A stamp is made _________ paper. Do you know what paper is made _________?
We can hardly tell what life without the Internet will be like in the future, _________?
It’ll be a great honour if I _________ to the charity evening party next week.