_____ by the advances in technology, many farmers have set up wind farms on their land.
Friendship is both ________ source of pleasure and ________ component of good health.
As ______ mountains surrounding our village are turning much greener, they have become ________ home to a large number of wild animals.
—You've dropped ________ “s” in the word “acros”. —Oh, ________ letter “s” should be doubled like this “across”.
We Chinese have a dream— ________ dream to turn a welloff life into ______ reality by 2020.
The teacher praised me for ________ progress I'd made, which was ________ great encouragement to me.