He did the right thing ___ for some fresh air even in cold winter.
John went to the hospital alone. If he_______ me about it, I would have gone with him.
When you _____ into the gallery, you feel as if you____ inside a fragile, white seashell.
The father often buys his son English learning materials, ____at encouraging him to learn English.
---You seem used to sleeping in the street. ---Oh, no. ______, I hate it, but I have nowhere to go for shelter.
One of the sides of the board should be painted yellow,and________.