sent, cent, scent

Sent or sent is the past tense ( yesterday, or some time ago) form of send--to cause to go; to propel or dispatch on its way--
Your message has been sent.
I sent you a postcard. Did you get it?

Cent or cent ( rhymes with sent ) means a penny--
You can't buy anything with only one cent.
The new one cent coin has a shield on the back.

Scent or scent ( rhymes with sent ) means an odor or aroma--the connotation is that this is a pleasant aroma--
The scent of roses perfumed the air in the garden.
That's a lovely scent you're wearing.

Now that you know that, you can say--
"I sent away for a sample of a new scent, but they wanted me to pay one cent for the postage."

Note--"cents" is the plural ( more than one ) of "cent"--
You get four cents change back from a dollar when you spend ninety-six cents.
Note # 2--"Sense" means a form of perception, as in the sense of smell, or the sense of taste. Sense can also refer to mental perception--
His cold interfered with his sense of smell, and he didn't notice the toast burning.
He had the sense that something was wrong
Don't you have any sense?
The plural of "sense" is "senses"--
There are five physical senses.
Sense may also be a verb ( action word) --meaning to perceive something--
I sense something wrong.
The third person singular ( he, she, it ) form of "sense" is "senses"--
He senses something wrong.
Note # 3--"scents" is the plural ( more than one ) of "scent"--
I tried on so many different scents that I can't tell if I like any of them.
You can identify scents with your sense of smell.