Based on the answers you didn't get right, here are reviews
For Question #1: The New Zealand dollar is called the Kiwi, a reference to the common nickname given to New Zealanders stemming from their national small, brown, furry and flightless bird.
For Question #2: Another nickname for the Australian dollar but nobody seems to know the history of this nickname.
For Question #3: EUR/USD is nicknamed the Fiber. It is a reference to the GBP/USD which is called Cable, and that it is somewhat looked upon as an "upgrade" based on the old telecommunications cable connecting the UK with the US. Another reason is due to the fact that the currency notes are made with 100% cotton "fiber."
For Question #4: USD/JPY is nicknamed the Ninja. This relates to the fact that ninjas came from Japan. But why not call it the Samurai?
For Question #5: Yuppy is the nickname for EUR/JPY, which you get when you phonetically smash together the letters of the name for this currency pair.
For Question #6: Gopher is the nickname of the GBP/JPY pair. Why? Nobody knows.
For Question #7: Guppy is the nickname for the GBP/JPY which comes from condensing the pair name phonetically.
For Question #8: An old nickname given to the USD/CAD pair is The Funds, which refers to the distinction made between USD and CAD deposits.
For Question #9: The U.S. dollar is called greenback because the paper notes issued during the American civil war in 1861. Those notes had a distinctive green coloring on the back.
For Question #10: GBP/USD is typically referred to as Cable. This nickname refers to the steel cable that was laid beneath the Atlantic Ocean in 1858 to enable telecommunications between the UK and US.
For Question #11: When CHF pairs with USD, it is referred to as the Swissy.
For Question #12: Ozzie is a variation of AUD's popular nickname, Aussie. In the UK, Aussie is in fact read as if it were Ozzie.
For Question #13: Loonie is the name most commonly given to this pair; a reference to the one dollar coin that carries an image of a bird called "loon."
For Question #14: The EUR/GBP is often referred to as the Chunnel, a play on words which comes from the name of the Channel Tunnel connecting the UK with France and the rest of Europe.