This advertisement is a___(type)example of their marketing strategy.

Therediscoveryofthisspeciesofbirdsisoneofthemost___(ordinary)scientificfindingsinrecentyears.

Now that you know all the facts ，you can make an informed___(choose).

Mary accepted Davids ___(invite)to join him for lunch.

Peopletodayarehighlyconcernedaboutthequalityoftheairthey___(breath).