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Раскрыть скобки. put the verbs in brackets into the correct infinitive form or -ing form. 1.it involves (slide) down extremly. 2.you can (lie down) or stand up. 3.whe standing up, both your feet are tired to the board to you from (fail off 4.prefer (keep) their feet untied. 5.you imagine (speed) headfirst down a sand. 6.because that is how fast you can expect (go). 7.you dont need (have) any experience