For the purpose of facilitating the application of any law in relation to the Union territory of Goa, Daman and Diu, the Central Government may, before the expiration of two years from the appointed day, by order, make such adaptations and modifications of the law, whether by way of repeal or amendment, as may be necessary or expedient to give effect to the provisions of this Act and thereupon every such law shall have effect subject to the adaptations and modifications so made until altered, repealed or amended by a competent legislature or other competent authority.