______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.
In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up.
Hiking by oneself can be fun and good for health. It may also be good for ______ building.
Some parents are just too protective. They want to ______ their kids from every kind of danger, real or imagined.
The loss has not yet been ______ accurately, but it is believed to be well beyond a hundred million dollars.
During the war there was a serious lack of food. It was not unusual that even the wealthy families had to ______ bread for days.