The book into thirty languages since it came on the market in 1973.
_____that the girl with an incurable disease would die soon, the boy decided to help her make her last days beautiful and meaningful.
Exploring _____space is exciting, yet dangerous. There is _____need for both robots and humans for space exploration.
Life is like time. Once _____, it never returns.
The company gave away 300 dictionaries to the students at the beginning of the term, and _____500 the next term.
While many believe Benjamin Franklin to have discovered electricity, recent findings seem to show _____.