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Like potatoes, turnips are rootvegetables that grow in the ground. Here is an old saying: you cannot squeeze blood out of a turnip. That means you cannot get something from a person that he or she is not willing or able to give.
Farmers have to separate the valuable parts of their crops from the waste. So separating the wheat from the chaff means keeping what is valuable and rejecting what is worthless.
Students often have to take a difficult test to gain entrance to a special school. So you could say the ones who are chosen are the best ones,or the cream of the crop.There is an old saying that forbidden fruit tastes the sweetest. That means some people get pleasure from doing something that they are not supposed to do.
Bananas are a popular fruit to eat. But if you go bananas, you are] wild with excitement or worry.
Finally, let us talk about lemons. Lemons have a sour taste if you eat them plain. But lemons make a nice drink when you mix their juice with sugar and water. So here is an expression about lemons that we like: If life gives you lemons, make lemonade. This means you should always try to make the best of a bad situation.