I phoned my first teacher time and again when I heard that he was ill, yet couldn’t_______
It is my ______to check that all doors and windows are locked after everybody leaves .
We all know that the Great Britain will ______the Olympic Games in 2012.
We drew this conclusion on the _______of research and experments .
A new ______bus service to Tianjin Airport started to operate two months ago .
The Olympic winner will receive a gold _____as an award .