1.) The economic situation has improved somewhat.
The fruit are not mellow yet- ripe?
8.) The bus had arrived punctually and we were at home in time for the beginning of the film. - I'd use the past tense here
a safe job or job satisfaction?- I'd use 'job security'
within 10 days after confirmation- of confirmation
14.) The value of the fee refers to the chart above. - unclear to me
red wine is last- wine lasts
19.) How many people took part at this demonstration?- in
24.) By the time he was eight, he has lived in France. - had
Student or Learner