"That ___ fun!" (3)
I believe the answer is:
was
(Other definitions for was that I've seen before include "'Is, in the past (3)'" , "(I/he) existed" , "(He/she/it) existed" , "Did live" , "Is no longer" .)
I believe the answer is:
was
(Other definitions for was that I've seen before include "'Is, in the past (3)'" , "(I/he) existed" , "(He/she/it) existed" , "Did live" , "Is no longer" .)