. So far we have done a lot to build a low-carbon economy, but it is________ ideal. We have to work still harder.
He is ill. He has kept_____.
Having finished the work,_____.
The boy had his leg _____ while ____ football.
He would rather ______ his parents with their housework than _____ out to play games.
_____ carelessly, the boy made mistakes here and there. .