Why was "However, that is not sufficient" deemed as incorrect?
I just wrote the same thing and got marked wrong. It has been reported.
'That is, however, not enough' seems exactly the same to me, but is considered a wrong answer ???
Arggh, 'that' wasn't accepted. Usually it's the other way around. ahah
Yes, I always try "that" first and I'm more often right than wrong. With "isso" though "it" is a possibility too. Always ask for the alternatives to be accepted when you lose a heart because of a demonstrative mismatch and you'll help everybody in the long run.