.By around 900 AD,there were many places in Northern Europe______the Vikings chose to live.
He set off __________ the direction of the river.
People try to avoid public transportation delays by using their own cars, but this __________ creates further problems.
It seemed selfish __________ them anything.
It's necessary __________ the car when you do not use it.
I found it __________ the purport of his speech.