ESPNcricinfo staff22-Jul-2016Cook was watchful against the new ball•Getty ImagesAlex Hales, however, never quite settled …•Getty Images… and on 10, he was bowled by a beauty from Mohammad Amir•Getty ImagesAmir celebrated with gusto after prising the opening•Getty ImagesJoe Root received a warm welcome from Amir, who struck him on the shoulder•Getty Images… but Cook continued to grow in confidence•Getty Images… while Root settled in against the legspin of Yasir Shah•Getty ImagesRoot was especially strong through the off side•Getty ImagesAfter lunch, Root reached his fifty from 86 deliveries …•Getty Images… and Cook followed suit from 90•Getty ImagesYasir endured a frustrating afternoon…•AFP…as Cook and Root took their partnership beyond 150•Getty ImagesWith tea looming, Cook reached his 29th Test hundred•Getty Images… placing him level with Don Bradman in terms of hundreds scored•Getty ImagesRoot was first to congratulate his captain•AFPCook was bowled for 105 by a delivery from Amir that kept low•Getty Images…but Root soon added a hundred of his own, his tenth in Tests•Getty ImagesJames Vince, however, failed to impress before falling for 18•Getty ImagesVince has now made 130 runs at 18.57 in seven Test innings•Getty ImagesRoot continued on serenely during the evening session•Getty ImagesGary Ballance added 73 with Root before chopping on to his stumps late in the day•Getty Images