Public transportation is only a viable choice for a number of people when it is both speedy and convenient. (inhabitat.com)
Because these all have lasers, they all need something to power them and batteries are really the only viable choice. (geekwrapped.com)
then 2 years ago i got rid of all grains but brown rice and introduced eggs (as free as possible but it is quite impossible) and wild oily fish (only viable choice — mackerel). (freedieting.com)