It sounded like something was wrong with the car’s engine then, ______ they would have carried on their journey.

The conservation area is very important for preserving many animals and plants, which would ______ run the risk of becoming extinct.

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

Under criminal law, people who      carry and use large numbers of fake banknotes will be sentenced to less than three years in prison.

--People should use public transport instead of their own private cars.--- _______.The roads are too crowded as it is.