we can not figure out ____quit a number of insects ,birds ,and animals are dying out .
Eating too much fat can _______ heart diseases and cause high blood pressure.
We thought of selling this old furniture, but we have decided to _______ it.It might be valuable.
It was hard to describe the nightmare she had _______.
News reports say peace talks between the two countries _______ with no agreement reached.
—The boss said we had only three days to finish the work.—Don’t worry.We have already _______ two thirds of it.