Once he saw his daughter back safe, his ______disappeared.
When asked how to revise the plan, he _______ his own opinions and suggestions.
The charity organization has launched a TV appeal _______ people should do as much as they could to help those survivors in the earthquake.
It has been widely accepted that only when the students take an active part in the class activities _______ the most effective.
. With the whole village _______, the villagers had to move to higher land, waiting for help.
The UN does not have its own army. _______, it borrows soldiers from different countries.