We shouldn’t spend our money testing so many people, most of ____ are healthy.
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.
I was wondering what to do with my car which won’t start ______ a kind man offered to help.
---Why does Peter look upset?--- He is a newcomer to the class and is having difficulty ______ by his classmates.