65. But there are no convincing reasons for believing that this would have a _____ effect on economic performance.

[A] partial          [B] preferable         [C] beneficial        [D] liable

66. The company has just _____ its plans for the coming year, including the opening of new offices in Paris.

[A] revealed      [B] relieved           [C]revised           [D] reversed

67. The _____ between rich and poor is wider in the South than in the rest of the country.

[A] difference       [B] distinction         [C] gap    [D] variation

68. Any investigation which covers a long ____ of time is bound to encounter certain special problems.

[A] rank    [B] span       [C] scope      [D] scale

69. Nevertheless, the United States maintained its military _____ in some African and West­ern Asian countries despite international protest.                      

[A] attachment       [B] involvement      [C] interaction      [D] communication