It seems that living green is ________ easy and affordable. A small step makes a big difference.

Why were you upset? The headteacher wasn’t blaming anyone. He         said things like that could be avoided. 

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

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

The earthquake damaged many houses and bridges; ______, it caused over 2,300 deaths.