29As we all know, the 2012 Olympic Games ______ in London, which is an ancient city

Guilin is a beautiful city and it is known________its mountains and lakes．

What I want tototeenagers is that being addicted to the Internet will to some extent do harm toboth mental and physical health．

________ the office, Ifound the naughty boy _________ beside my desk, trembling

________ have you stayed in this hotel—Not long, just ________ this Monday.