题目内容：

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Have you ever forgotten where your socks are when you wake up in the morning? Can you remember what you ate f1. lunch a week ago? You may think that being forgetful is not a good thing. B2. now you should be thankful.

Scientists from University of Toronto f3. that forgetting is a key part of learning. Getting rid of(去除) unnecessary(不必要的) information can help our brains w4. better. What k5. of information is unnecessary? Scientists say that this may have something to do with the environment(环境) you l6. in.

In an environment that is always changing, our brains may require(要求) us to remember less. A supermarket cashier(收银员) meets many people every day and will probably only r7. them for a short time. But a designer(设计师) who often meets clients(客户) will remember longer.

However, being forgetful is not a8. good. When you don’t have e9. sleep, you may have a hard time remembering new information. Sleep h10. the brain store and keep new information, Matthew Walker from the University of California told the Huffington Post.