71. In the 1970s.
72. They are freestyle, ramp and street-style.
73. This was a combination of freestyle and ramp.
74. Because this allowed them to skateboard safety.
75. Yes, it is and there are lots of competitions.
IX.
76. I took part in swimming competition at school last week and won third prize.
77. I can't play soccer with my classmates this afternoon because I have to visit my grandmother in the hospital.
78. I should finish my homework before playing sports.
79. I do judo twice a week and go to a dance class too.
80. Soccer or football is the most popular sport in Vietnam.
