[Q]: Which of the following solutions is better for the following goal:
In order to put shingles on a roof,

OPTIONS:
- lay the shingle down in the position you want it, then use a nail gun to put several screws along the top.
- lay the shingle down in the position you want it, then use a nail gun to put several nails along the top.

[A]: lay the shingle down in the position you want it, then use a nail gun to put several nails along the top.

[Q]: Which of the following solutions is better for the following goal:
How to naturally add nitrogen to my soil?

OPTIONS:
- Beans and peas are climbers, and they add nitrogen to the soil. When they die back, their foliage fertilizes the soil, strengthening the next plants. Swiss chard and kale add nitrogen also.
- Beans and peas are climbers, and they need a lot of nitrogen which depletes the soil. Add swiss chard and kale to replenish the missing nitrogen along with some potash if accessible.

[A]: Beans and peas are climbers, and they add nitrogen to the soil. When they die back, their foliage fertilizes the soil, strengthening the next plants. Swiss chard and kale add nitrogen also.

[Q]: Which of the following solutions is better for the following goal:
What sort of iron is needed to complete the solar alarm?

OPTIONS:
- A soldering iron.
- A soldier iron.

[A]: A soldering iron.

[Q]: Which of the following solutions is better for the following goal:
To fill a car with gas.

OPTIONS:
- Drive near the gas pump, then activate the pump and insert the nozzle into the gas tank, then start the pump.
- Drive near the gas pump, then activate the pump and insert the nozzle into the gas tank, then stop the pump.

[A]:
Drive near the gas pump, then activate the pump and insert the nozzle into the gas tank, then start the pump.