__________ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
We have very strict quality control and anything imperfect is ____, so customers feel secure about our products.
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.