【2014山东莱芜】B)根据句子意思，用括号中所给词的正确形式填空，每空填一词。
60. No driver is needed. The new car can run by____(it).
61. They are sitting in the comfortable chair and chatting___________(happy).
62. Brazil will hold the___________(twenty) FJFA World Cup on June 12th, 2014.
63.I think one of the___________(easy) ways to make you strong is to exercise more.
60.itself
61.happily
62 twentieth
63. easiest
