It’s no good + -ing

Q. The only ________ to me is as they were successful on the first attempt, how come some years before it had taken me four tries!
(a) confusion (b) mystery (c) intrigue (d) unknown

~ Ans: http://examaxe.com/English-Question-Answer/10990

Q. An organism with a single ________ is called protozoa.
(a) cell (b) sell

~ Ans: http://examaxe.com/English-Question-Answer/24851