As is often pointed out, knowledge is a two-edged weapon which can be used ________ for good or evil.
In the survey they listed twelve kinds of food _______would affect the work of the brain.
The house rent is expensive.I’ve got about half the space I had at home and I’m paying _______ here.
I really appreciate _______ to help me out.
With world economic crisis worsening, people _______ the government for more unemployment benefits.
Neil _______ in Xiamen for five years before he finally decided to go back to Scotland.