If he continues to ignore his disease, one day he'll reach the point __________ he can't walk by himself.
—Tony said he could fix my bicycle, but I really doubt it. —_______. He’s very good at this sort of thing.
This article may be some advice about how to _________ oneself in society.
The environmental problems in China may worsen if __________ unsolved.
_____ cleaning the doghouse was the last thing I wanted to do, I did it with all my efforts.
Constant practice has erased my accent to a point _____ people think I’m a native speaker.