30. The world is ______ seven continents and four oceans.
Do not expect pupils to be identical.Every child is________, with their own needs, preferences and talents.
It is the prevention of disease ______its successful treatment that has led to the rapid increase of the world’s population.
Do you wake up every morning __________ energetic and ready to start a new day?
Not until all the fish died in the river, ____ how serious the pollution was.
In France, ______ you go, you will always see a gentleman holds a door for a lady.