Today’s world is changing rapidly, making _____ necessary for us to continue learning otherwise we can’t keep up with the time.

She owns a lot of books, most of _____ are written in English. 

Helping others is a habit, ___ you can learn even at an early age.

Yuan Longping makes ____ possible to produce more crops in the same fields with this special strain of rice 

France has ______for everyone, ______why not visit France this year?