It is generally accepted that ___ boy must learn to stand up and fight like ___ man.
________ stopping polluting the earth ________ hope to live in a better environment.
His friends were ___________and encouraged him to publish his ideas, but Copernicus was cautious.
Our school was ________ in 1925 and has a history of more than 80 years.
Our class _______ 55 students at that time.
Having never met with such a _____ problem, he felt _____ and didn’t know how to solve it.