The best way to explore _______ countryside is on _______foot.
As the idea of low-carbon life is now _____ accepted, more and more people travel by public transport.
—I’d like to have a chance, someday, to return your favor of paying for my lunch yesterday.—_______. You are my best friend.
We tried our best and won the football match ____ one goal in the end.
Mark Zuckerberg is the founder of the site Facebook, ______ you can have a look at each other’s pictures.
I tried every means to reach my goal but failed. So desperate ______ that I almost lost heart.