A car accident happened on the highway because of the heavy fog, but 　　　 no one got seriously injured. 

You can get off the bus one or two stops ________ and walk the rest of the way to work every day so as to take some exercise.

---I have seen so little of Mike______. Is he away on business?---Oh, no. He just leaves for his office and returns very ______.

The mother looked at the door _______，expecting the children’s coming．

There is no need to add in trees to create shade because many town and city gardens are __________ shaded by buildings.