England vice-captain Alastair Cook hit his fourth straight half-century of the series on a largely uneventful morning in the fourth Test against West Indies on Monday.At the interval, England, trailing West Indies by 149 from the first innings, reached 115 for one in their second innings with Cook unbeaten on 58 and Owais Shah not out on 13.Cook reached his landmark from 86 balls, when he square drove Sulieman Benn through backward point for his eighth boundary, but he was fortunate to have survived until the interval.On 38, Cook offered a difficult chance off Sulieman Benn to Brendan Nash running back at mid-wicket.But England captain Andrew Strauss was not so fortunate, bowled for 38 when he dragged a drifter into his stumps off West Indies captain Chris Gayle, bowling his uncomplicated off-spin.England trail in the five-Test series 0-1, following an innings and 23-run defeat in the opening Test at Sabina Park in Jamaica, the abandonment of the second Test at the Vivian Richards Cricket Ground in Antigua, and a draw in the third Test at the Antigua Recreation Ground.The fifth and final Test of the series starts next Friday at Queen's Park Oval in the Trinidad capital of Port of Spain.