21．Darius Brown is a 14-year-old boy in the eighth grade.He lives in Newark，New Jersey.When he was 2 years old，doctors told his mother，Joy Brown，that he had a fine motor skills disorder （精細運動技能障礙） which could make it hard for him to do things with hands，like tying shoes and using scissors.And the poor boy can never recover.
When Darius Brown was 8 years old，his elder sister，Dazhai，taught him how to make a bow tie （蝴蝶領結）.At first，Joy worried that he might hurt himself. "
He was resolute to learn how to make bow ties，" said Joy. "So he sat and watched Dazhai for months and took it all in.Then he practised and practised. " Before long，she said， "he was making bow ties by himself." One day，he made a bow tie out of Ninja Turtle fabric （忍者神龜布料）.He wore the new bow tie to school the next day.His friends wanted such bow ties of their own.So Darius began to make more.
In 2017，he found a great use for this new skill.That was the year Hurricane Irma hit Florida and Puerto Rico.The powerful storm flooded homes and streets.It left hundreds of dogs and cats homeless.The dogs and cats needed families to adopt them.Darius said he realized he could help.He would give the animals special bow ties to make them look cute.Darius learned that some of the rescued animals were brought to an animal shelter in New York City.So he dropped off about 25 pet-sized bow ties.It worked even better than he'd expected.Darius realized that such a small thing could give a homeless animal a better chance of being adopted.
Darius has donated more than 600 bow ties to shelters since starting his project in 2017.Shelter workers say that Darius' bow ties are of great help.
（1）What will trouble Darius Brown for all his life？ （no more than 5 words）
（2）What does the underlined part in Paragraph 2 probably mean？ （no more than 5 words）
（3）How did Darius' classmates think of his Ninja Turtle bow tie？ （no more than 5 words）
（4）According to Darius，what would be the result if a homeless animal wore a bow tie？（no more than 10 words）
（5）What do you think of Darius Brown？Please explain. （no more than 25 words）
