improve
一You don’t go to that supermarket quite often, do you?—No, I only go there ______because it’s too far away from my house.
The girl arranged to have piano lessons at the training center with her sister ______ she would stay for an hour.
Dave nearly ran into a block when walking down the street with his mind ______ on the word puzzle.
______ is the kindness of the nurse that the patient can never be _______ to her.
Since nobody gave him any help, he ______ have done the research on his own.