Terms for subject Cliche / convention containing be that of

English	Russian
of that there can be no doubt	в этом не может быть сомнений (UFOs are real, of that there can be no doubt. It all depends, though, on what you mean by 'real'... (Janet & Colin Bord, "Unexplained Mysteries of The 20th Century") ART Vancouver)
that's the least of my worries	это меньше всего меня беспокоит
what's the good of that?	а что толку? (ART Vancouver)