19．but，follow，cool，bad，first，sports，easy，walk，child，kind
What's the coolest kind of transportation for middle school students during the winter holiday？A racing bike？A car？No，It's a special （102）kindof shoe called Heelys（暴走鞋）．Heelys look just like common（103）sportsshoes，but they have a wheel hidden in the heel．So instead of （104）walking，kids can"fly"around in them．
"Wearing Heelys is fun and （105）cool，"said Wu Peng，a boy who wore them on his （106）firstday back at No.12Middle School in Beijing．Wu Peng said he loves the shoes so much that he wears them wherever he goes．Sometimes he even （107）followshis parents'car to the supermarket on his Heelys!
Other students think these are very cool，（108）butsome haven't been so lucky with their Heelys．It's reported that some （109）childrenhave fallen down while using these shoes，and some have been hurt．
"Heelys wheels are on the heels of the shoes，so it's（110）easyto fall，"said Liu Rui，a doctor at the Hong Kong International Medical Clinic，Beijing"Even（111）
worse，"Liu said，"Wearing Heelys for a long time could stop young people from developing their ankles（腳踝）and legs．"
