1. Hey, if the shoe fits, wear it.
Meaning: If a remark applies to you, you should admit that it's true.
Origin: This proverb comes from an older expression popular in the 1700's: "If the cap fits, put it on." The "cap" refers to a dunce cap. As the years went by, "cap" changed to "slipper", perhaps because of the popularity of the story of Cinderella. And later, "slipper" changed to "shoe." The idea is clear: Accept a comment that refers to you as you would wear a shoe that fits your foot.
2. Mariel loves to be in the limelight.
Meaning: the center of attention.
All theaters today have powerful electric spotlights that throw bright beams of light on featured performers. In many theaters, beginning in the 1840s, the beam was created by heating lime, a form of calcium oxide, until it produced brilliant white light. A strong lens directed it onto the dancer, juggler, actor, or singer on stage. Anyone "in the limelight" was the center of the audience's attention. Today, we say that anyone who gets a lot of attention, especially from the media, is in the limelight.
3. Well, I'll be a monkey's uncle! I would have never thought cloning a living being would be possible in my lifetime.
Meaning: an exclamation of surprise or disbelief.
In 1871, Darwin published the "Decent of Man" outlining his theory of evolution, sparking controversy that continues today. Darwin’s scribblings were met with a great deal of derision and skepticism. The idea that man was descended by apes was considered the most outrageous of claims and offensive to many, especially religious-folk. "I’ll be a monkey’s uncle" was originally a sarcastic remark made by non-believers of Darwinism, and meant to ridicule the entire idea of evolution. It isn't used as much today. We tend to say: "Well, I'll be..." or "I'll be damned!"