Argument and hostility can both be countable, but they also have uncountable meaning:
We had an argument.
Argument is a good way of learning logic.
'Hostilities' tends to refer to conflict, such as the fighting in a war.
I would use 'plants' as a plural to avoid saying '2 works'.
The man of the minute is famous at the moment, but not for long.
'Airs' (plural) can be pieces of music or the impression someone creates.
I'd say 'What advances will there be in the near future?'
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