Finish the second sentence so that it has a similar meaning to the first one, beginning with the given words.
17. Today it doesn't take as many people to work on the farm as it once did.
It used
18. A tractor cannot work as efficiently as a combine harvester.
A combine harvester can work
19. Life in big cities is more stressful than life in the countryside.
Life in the countryside is less
20. Farm work can be much easier because of the development of huge, automated machines.
Thanks to
17. Today it doesn't take as many people to work on the farm as it once did.
It used to take more people to work on the farm than it does now
18. A tractor cannot work as efficiently as a combine harvester.
A combine harvester can work more efficiently than a tractor
19. Life in big cities is more stressful than life in the countryside.
Life in the countryside is less stressful than life in big cities
20. Farm work can be much easier because of the development of huge, automated machines.
Thanks to the development of huge, automated machines, farm work can be much easier