1,Research universities have to keep up with the latest comp

1,Research universities have to keep up with the latest computer and scientific hardware_____price.
A.on account of B.in addition to C.regardless of D.not to mention
2,The professor could hardly find any sufficient grounds_____his arguments in favor of the new theory.
A.to be base on B.to base on C.which to base on D.on which to base
还麻烦讲解翻译一下.