Prof. Richard was crazy about his research. His illness_________ his many years of hard work and irregular diet.
This machine is very easy ______. Anyone can learn to use it in a few minutes.
Every minute must be made full use _______ in class.
While these activities might cause laughter ______ respect, in reality they require an enormous amount of strength.
You can imagine what great trouble we had ______ the new school.
The Chinese government has passed a new regulation forbidding supermarkets and stores to ______ free plastic bags to shoppers in order to protect the environment.