— Why do you look so worried? —My computer broke down and my essay ______ unfinished since.

As the war in Libya goes on, an increasing number of people in the country         from their homes and         a safe place to stay. 

The silence in the dark building was scaring. No sound and voice____ heard at that moment. 

To our great disappointment, a lot of jobs ______ if the factory closes.

Look out! That tree _____ fall down.