We have every reason to believe that ______ 2010 World Expo in Shanghai will be ______ success.
_____ it will do us harm or good remains to be seen.
Although he was a teenager, Robert could resist _______ what to do and what not to do.
People love to waste time on the Internet and if it's funny they'll go there, ________ who put the information there.
It suddenly _____ him that he had taken the wrong bus.
To start with the aim of doing harm to others is only to ________ ruining oneself.