It is impossible for ______ little children to do ______ much work in ______ a short time.
The World War II made ______ impossible for Einstein to go on with his research.
It’s not ______ good idea to drive for four hours without ______ break.
--- Would you be able to go to the party ? --- _______.
Three fourth of the homework _______ today .
______ good, these cookies sell well.