His method of doing research work is hardly appreciated; he feels inferior ______others.A．

The ______ of his first complaint led him to contemplate pursuing stronger methods to obta

One machine can do as much work as ______.A．40% of the peopleB．4% of the people in the wor

John Smith arrives at the New World to do his research on Indians.（)

John Smith comes to the New World to do his research on gorillas.（)

Operation research is a scientific method of providing executive department with a quantit

After years of constant and fruitful research his dissertation is gradually() .