Mrs. Johnson's ______ (每年) income is US $20,000, half of which is used for her children's education.
Do you have any idea how to ______ (促进)the sales of this product?
There are too many ______ (商业的)programmes on TV.
More than 12,000 people were ______ (陷人困境)under the destroyed buildings.
Rockets have found application for the ______ (探索)of the universe.
There is a great ______ (竞争)between the two companies.
We have to learn to prevent ______ (放射性的)pollution or it will harm human beings.
Anything that is dropped falls towards the centre of the earth because of the pull of ______ (重力).
Most African and Asian nations have pushed for a tough ______ (条约)with a total ban on sponsorship and marketing.
Now there are still thousands of people living in an ______ (极度的)poverty.