Use the words and phrases to write a passage 1.In / 1970s , skateboarding suddenly / become very popular 2.At first , skateboarders / move slowly / flat , smooth areas 3.Then they / begin / ride quickly . This / be called " freestyle " skateboarding 4.Soon they / be skateboarding skillfully up ramps / doing tricks in the air 5.This / be called " ramp " skateboarding . Then they / start skateborading / doing tricks / the street 6.This / be " street-style " skateboarding - a combination of freestyle / ramp 7.For this , the skateboarders / need protective clothing / as knee and elbow pads / helmets . This / allow them / skateboard safely 8.Today skateboarding is still / very popular sport , and there / are lots of competitions Giúp em với ạ , em cần gấp