.What a great weight the mother felt _____ her mind the moment she found her lost son!
I don’t have money or time in hand; _____, I can’t accompany you to the Parkson Mall today.
In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.
We all thought that Betty could have run _______ if she had worn the sports-shoes that day.
In that traffic accident last night the man who hit five people in a row had drunk so much that he could no longer_______ between fantasy and reality.
Mr. Andrew taught his students how to develop the basic skills in the physics class, ______ everything through jokes and experiments.