Choose the correct form of the adjectives / adverbs

1. It is
   [more difficult|the most difficult]
   to find a job in the country than in the city.
2. It's getting
   [hardest|harder]
   and
   [hardest|harder]
   to find a top job these days.
3. The
   [much|more]
   you practise typing, the
   [easier|easiest]
   it gets.
4. Tom is
   [the most hard-working|more hard-working]
   employee in the company.