Could you tell us ______ happens when one student in class expresses a personal opinion _______ maybe upsets other students?
You’d better put things back______. Otherwise, it will be difficult to find them.
It is_____the pupils do in their spare time_____ really______ them to take their place in society as citizens when they grow up.
The tower_____ in the 1800s is the oldest building in this area.
The computer system ____suddenly while he was searching for information on the Internet.
Linda was in____ dilemma when she was required either to complete the dangerous travel before____ deadline or to stay where she was forever.