In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

Article: Do you want to be a successful person? Would you like to know how successful people usually think and what drives them? Here I am going to tell you the key to success that successful people share. First of all, successful people never blame someone or something outside of themselves for their failure to move ahead. They realize that their future lies in their own hands. They understand that they can't control things in life, such as nature, the past and other people. At the same time, they are well aware that they can control their own thoughts and actions. They take responsibility for their life. Perhaps what most separates successful people from others is that they live life "on purpose" --- they are doing what they believe they are put here to do. In their opinion, having a purpose in their life is the most important element that enables them to deal with things around them. They hold the view that when they live their life "on purpose", their main concern is to do the job right. They live what they do. People want to do business with them because of their commitment. To live their life "on purpose", successful people find a cause they believe in and create a business around it. Besides, they never give up easily. Once they have set up goals in their life, they are willing to do whatever it takes to achieve their goals. To achievers always bear in mind what they don't have forever. Rather than see this as negative or depressing, they would use the knowledge to _ themselves on and go after what they want energetically and passionately. So keep in mind what successful people always hold to be true so that you will have a clear idea of what you should do to be successful in life.
Answer: you shouldn't waste time
According to the passage, to be successful, _ .

Article: A traveler once visited a city where everyone wore blue. Puzzled, he went to a dyer and said, " Please dye the handkerchief red." "I don't know how to dye red." "Then dye it green." "I can't dye it green. There are forty master dyers in this city, and every one of us can dye only blue." "I can dye all color1s," said the traveler, "Hire me and I'll teach you my art." "We never allow a stranger to enter our craft ", said the dyer. The traveler made the same offer to the other master dyers, but none would hire him. So he began his own dye shop. Folks soon crowded around asking, "What are all these beautiful color1s called?" He answered, "This is red and that is yellow," and so on. Everyone began bringing him cloth to dye. When the master dyers saw this, they quickly apologized for their past insults , begging him to hire them and teach them his art.
Answer: the dyers didn't use machines
To the traveler, the strangest thing about the city was that _ .

Article: According to a famous optical expert, Alexander, who recently visited Shanghai, the developed countries in Europe and America have made rules that children must wear resinous glasses instead of the traditional glasses made of glass. This is because the glass glasses are more likely to do harm to children's eyesight. Alexander pointed out: wearing the right glasses as soon as possible is still the best way to cure and put right children's eyesight problems. In America and Japan the resinous glasses have taken up 80 percent of the glasses market. And some European countries and America have made it a law that children, teenagers and drivers must wear resinous glasses. Now, about 10 million children in China have different eyesight problems and they need timely treatment. But still, too many parents are buying the traditional glass glasses for their children. This is mainly because many parents know little or nothing about the good points of the resinous glasses. Besides, the price for the new glasses is a little higher than the traditional ones.
Answer: we should wear resinous glasses instead of glass glasses
This news article mainly wants to tell us _ .