Choose the correct verb form

1. At 5 o'clock the mechanic
   [will have repaired|will have been repairing] the tractor for an hour.
2. By 2050, the global population
   [will have been increasing|will have increased] to 9 billion.
3. By the end of the year, the author
   [will have finished|will have been finishing] his new novel.
4. By the time they reach the farm, they
   [will have travelled|will have been travelling] for two hours.
5. It's no use going to the supermarket now; it
   [will have been closing|will have closed] by the time we get there.
6. Mary
   [will have been writing|will have written] her report by Friday.
7. The gardener
   [will have mowed|will have been mowing] the lawn by noon.