It's hard to track__________blue whale in that ocean, which has been killed off by commercial whaling and is now listed as__________endangered species.
The _____ of his clothes indicated too clearly that he had been playing football.
When the entire class worked together they finished the project _____.
Paper making began in China and from there it _____ to North Africa and Europe.
Children who are over-protected by their parents may become _____.
It would be _____ a risk to let the child go to school by himself.