I wonder that makes him so sad.
Before you____the design of this product, you need to study the market carefully.
Our government is trying its best to ____the social security system to protect people’s rights.
Although the painting is very ____ pleasant, it is thought to be copied with a modern printing machine.
The spokesman said that this was a(n)____negotiation (谈判) because it solved a lot of problems between the two sides.
Although the average reader spends more than 4, 000 pounds on books in their lifetime, 55 percent say they buy them for decoration and have no____of reading them.