Teenagers can be great adventurers（探險(xiǎn)家） In August，Bao Naixuan，a 14-year-old student from Qingdao No.39 Middle School，became the youngest person to finish the Rizhao-Qingdao OP sailboat race on his own.The race was 66 nautical miles（海里）long，about 122 kilometers long.
   The OP，also k（1）

nown

nown

as the Optimist，is a small，single-handed sailboat that is easier to sail（航行）than larger boats.It is suitable（適合的，合適的）for younger sailors.But this doesn't mean Bao's adventure was s（2）

imple

imple

.He sailed for three days without stopping all by himself.
   The journey is a tough mental（精神的）and physical challenge for a（3）

dults

dults

，let alone a teenager.During the race，Bao found h（4）

imself

imself

in a windless area in the Dongjiakou Channel.He risked being hit b（5）

y

y

passing ships if he didn't keep moving.To keep himself safe and continue the race，he had to paddle（劃 槳）for a few hours without the help of the wind.This c（6）

aused

aused

him to fall five hours behind other sailboat racers.
   To catch up，Bao had to sail for about 11 hours each day for the rest of the race，longer than he'd been sailing previously（之前地）.At night，he had to f（7）

ace

ace

the unknown ocean alone in the dark.
   L（8）

uckily

uckily

，Bao had the skills to beat the other sailors.He has sailed s（9）

ince

ince

he was 9 years old with the help of his father，a sailing coach.He practices sailing e（10）

ven

ven

during holidays.
   "Sailing is very interesting and helpful.It has taught me how to fight against pressure and unleash（釋放）my potential（潛力），" Bao said.