“If you’re walking down the right path and you’re willing to keep walking,_____ you’ll make progress”, said the president Obama.

Just a month before the earthquake the school practiced an emergency drill showing the children how to __________ find their “safe place”.

Progress so far has been very good．We are,    __, confident that the work will be completed as expected．

With the word “PM2.5” ____ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days. 

Light-to-moderate smokers were ________ to die of sudden heart problems than those who had never smoked.