1 . 根据下面短文内容, 在短文的空格处填上一个恰当的词, 使短文完整、通顺。
     As an English-learner, you must know some common idioms. An idiom (习语) is a phrase that cannot be understood word by word. It often needs real-world environment and much life     1     to understand.

“It’s not rocket science”

“It’s not rocket science” is a common English idiom that’s used to show how     2     something is, especially compared to rocket science. It has the same meaning     3     the-very-popular idiom — “it’s not brain surgery (手术).’’ We don’t really know     4     it came from; We just know it was commonly used in the late 1900s. For example, to cheer a friend up, you may say to him, ”Get yourself together! It’s really not rocket science.“

“Don’t put all your eggs in one basket”

“Don’t put all your eggs in one basket” is an idiom that     5     “don’t risk everything on one plan or idea .” The phrase suggests that someone puts all the eggs they have in one basket and is then at risk of breaking the basket and losing     6     they worked hard for. The first example of the idiom     7     in the 17th century in writing. It was likely in Spanish or Italian. There is a wonderful quote from Don Quixote by Miguel de Cervantes. It reads, “It is the part of a wise man to keep himself today for tomorrow, and not venture all his eggs in one basket.”

“Call it a day”

“Call it a day” is a simple idiom. It is used when someone wants to tell others they’re done with work for the day. That “work” could be their job, exercise, a creative activity, cooking, or housework. According to Dictionary. ”Call it a day“ first appeared in writing in 1919.     8     you want your workers to go home and get some rest, you can say, “Okay, let’s call it a day here and start work again tomorrow.”