Eat-up Campaign has became        hot topic, calling for people to takeaction against waste.

Each member of ____ Green Pace Club is required to gain ____ better understanding of their system.

Studies show the MP3 people have made much use of ______ music may be causing hearing loss in many people. 

The use of Chinese by teachers in ______ English classroom must be restricted because it will decrease _______ time when students are exposed to the English language.

We can never expect____ bluer sky unless we create_____less polluted world.