It is believed that hard work is the ____ of one’s success.
So far we have done a lot to build a low-carbon economy, but it is ___________ ideal. We have to work still harder.
This restaurant wasn't ___________ that other restaurant we went to.
The number of people invited __________ fifty, but a number of them __________ absent for different reasons.
__________ to my __________, China's strong winter snowstorms caused such huge economic losses.
After that, he knew he could __________ any emergency by doing what he could to the best of his ability.