In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up.
_________,they’ll carry on the work until they can get the money they need.
Every minute should be _________ lessons.
_________ that it’s very cruel to kill wild animals for money.
Arguments happen when people _________ each other’s views.
There is _________ that her daughter will pass the exam to go abroad to study.