I challenge you to sing a song in English., Do you reckon you could spend a day without going online?, I bet you can't think of four countries that begin with "M"., I bet I can hold my breath for more than 20 seconds., I challenge you to hop in one foot for 1 minute., Do you reckon you could learn Japanese?, I bet you can't say five words in English beginning with C in 25 seconds, I bet I can blink for 5 minutes..

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