We need some for the fruit salad.

Gases from cars are the air of our cities. [ ]

Each year __________ fishes are killed by the polluted water and many people are made sick by thepolluted air .—-So we should do something to stop it .

Why did she get so mad It was only a joke.

With the word“PM25″_____ appearing in media reports，people pay greater attention to it and seek health tips for smoggy days