The word “ungelievable” based on Chinese, which has become a big hit online very quickly, ____a message that Chinese can also serve as an addition to English vocabulary. 

 ______ 6 world powers have accepted ______ Iranian offer for talks on its disputed nuclear program.

Being able to speak but not write is like living in a(n)__________ mansion and never leaving one small room.

In fact fuels we burn and plant food we eat ______ their chemical energy in the form of heat.

It is reported that a powerful earthquake ______the Italian island of Sicily early this morning.