Taking a plane can be stressful, and it is made even more so when something unexpected happens-unless you get    1    angel on Earth, like one father did. After    2    （try）to check in for an upcoming flight with his daughter, the man    3    （tell）that his 2-year-old daughter would need her own ticket. He    4    （think）she was free of charge because of her age. The father was    5    （obvious）depressed, saying he didn't have the money, and walked away to make some phone calls. That's when a    6    （strange）stepped forward, approaching the counter to tell the airline conductor that she wanted to pay for the little girl's ticket—all $749 of it. The man was very surprised and    7    （thank）. He asked for the woman's name so he could repay her, but she insisted    8    remaining anonymous（匿名的）. The only thing anyone knows about her is    9    she did that day, thanks to a photo of her good deed circulating on Face book. More than 100,000 people made    10    （comment）on Face book and praised the woman for her kindness.