Choose the most suitable linker

1. If recycling were mandatory, it would reduce waste.
   [However|Moreover]
   , it would help the environment.
2. Volunteer work is rewarding.
   [For example,|Such as]

it helps young people to develop their confidence.
3. Space exploration is very costly.
[On the other hand|So]
, it would help mankind discover new things.
4. [All things considered|Although]
, I feel that making recycling mandatory would be an excellent way to help the environment.
5. We should reduce the price of public transport.
[Secondly|As a consequence]
, people would be likely to use buses instead of cars.
6. The agency helps unemployed people to find work.
[For instance|To sum up]
, they provide education and skills training.