England were made to work hard by Fiji in their World Cup opener but pulled away in the last 20 minutes to secure a bonus-point win at Twickenham.Two tries from full-back Mike Brown and the impact of a superior set of replacements saw Stuart Lancaster`s men home despite a disjointed display.Had the Fijians landed their kicks a tense contest could have been significantly tighter still.England`s next match is against Wales at the same venue next Saturday.And despite a stuttering opening display, England have a platform on which to build as they seek to win the Webb-Ellis trophy for the first time in 12 years.Score:England (18) 35Tries: Penalty, Brown 2, B Vunipola Cons: Ford, Farrell 2 Pens: Ford 2, FarrellFiji (8) 11Try: Nadolo Pens: Nadolo, Volavola