A sentence with the word niches could be:
"They were trying to find their respective niches so as to be better at their jobs"
It means that they were trying to find an appropriate position for a person.
B. The boys have already gone swimming.
<span>Six people died in the play "Romeo and Juliet" - Mercutio, Tybalt, Lady Montague, Paris, Romeo and Juliet. </span>
A canned soft drink is usually measured in fluid ounces (fl.oz.) because it is a liquid, and is not big enough to be measured in quarts or gallons like jugs of milk would be.